WO2004051177A1

WO2004051177A1 - Firearm simulation device

Info

Publication number: WO2004051177A1
Application number: PCT/IL2003/000926
Authority: WO
Inventors: Alexander Homsky
Original assignee: Alexander Homsky
Priority date: 2002-11-06
Filing date: 2003-11-06
Publication date: 2004-06-17
Also published as: IL152679A0; AU2003282335A1; US20060027225A1

Abstract

A method and apparatus for simulating the cycle and recoil of a firearm. The apparatus and method comprising, firearm device (10) which includes a source of compressed gas (11), mechanism (12) configured to release gas from the source of compressed gas, and a piston (14) configured to respond to the force of the compressed gas. Preferably, the firearm device of the present invention features a barrel (13), a magazine (15), a firing pin (16), a chamber (18) for readily accommodating a piston, a piston (14) and a plurality of vents (20).

Description

FIREARM SIMULATION DEVICE

FIELD AND BACKGROUND OF THE INVENTION

The present invention relates to a firearm device. In particular, it

concerns a firearm device featuring a barrel unit and a piston unit, wherein the

piston unit is accommodated by the barrel unit. Moreover the present invention

is of a firearm, which employs compressed air to simulate cycle and recoil.

Firearm simulators have wide use in training systems, which are

configured to train personnel in the proper use, judgment, safety, and accuracy

in utilizing firearms and in simulation games.

The background art describes a variety of firearm devices and firearm

cartridges, which includes U.S. Patent Nos. 5,962,805, 5,842,300, 6,095,051

and 6,253,682.

U.S. Patent No. 5,962,805 discloses a cartridge, which has a case

comprising a body housed telescopically within a sleeve. The body encloses a

main chamber, which contains gas under pressure, and a valve mechanism for

venting gas from the chamber into an expansion chamber. The pressure of the

gas in the expansion chamber causes the body to displace rearward relatively to

the sleeve to apply a force to the breech block of the weapon in which the

cartridge is used, thereby to initiate the reloading cycle. Gas is vented from the

expansion chamber to eject a projectile when a spigot projecting from the body

is withdrawn from an aperture in the end wall of the sleeve. U.S. Patent No. 6,095,051 discloses a cartridge for use in a firearm, the

cartridge having a projectile mounted in or on a nose portion thereof; the

cartridge interior communicating with the projectile via a gas passage, a valve

for controlling propellant gas flow through the gas passage, and a movable

member, which upon firing is propelled rearward from the cartridge against a

breech block of the firearm by the pressure of propellant gas within the

cartridge so as to recycle the firearm; characterized in that the valve is arranged

to close in order to stop or substantially reduce the flow of propellant gas

through the said gas passage after the projectile has been fired from the

cartridge, thereby to facilitate rearwards propulsion of the movable member.

U.S. Patent No. 6,253,682 discloses a cartridge comprising a casing

having a passage extending there through. A core member is slidably received

in the passage, and has a forwardly facing piston surface and a portion closing

the forward length of passage in the inactivated condition of the cartridge. A

cavity within the core member receives propellant gas from a primer and

discharges the gas into the passage forwardly of the piston surface. The core is

propelled rearward and releases propellant gas into the forward passage section.

U.S. Patent No. 5,842,300 describes a retrofittable laser system with

which a user can convert his/her own personal firearm to a training firearm

simulator incapable of firing liye ammunition and then convert back to the

original operational firearm configuration. More particularly, the present

invention relates to retrofittable laser system, which is integrally mounted

within a standard barrel of the laser simulator barrel and electronic means firearm having power mountable in a retrofittable ammunition magazine. An

optional recoil means may also be incorporated into the retrofittable barrel

and/or retrofittable ammunition magazine.

Disadvantages associated with the simulation firearm devices of the

background art include high cost of bullets and the need to replace the bullets,

due to wear and tear. The background art does not provide a firearm device,

whereby the piston is part of the barrel. Such a device as in the present

invention provides a mechanism, which can use compressed gas or fluid to

simulate cycle and recoil of a weapon, which can be used indefinitely and is

less costly than using bullets.

There is therefore a need for a firearm device, such as disclosed in the

present invention. Such a firearm device provides a solution to the problems of

costly bullets and slow magazine change, which are associated with simulation

firearm devices of the art.

SUMMARY OF THE INVENTION

The present invention relates to a firearm device. In particular, it

piston unit is accommodated by the barrel unit. Moreover the present invention

is of a firearm, which employs compressed gas to simulate cycle and recoil.

In a first embodiment the present invention provides a firearm device

including (a) a source of compressed gas; (b) a mechanism for releasing the

source of compressed gas; and (c) a piston configured to readily facilitate cycling the piston's response to force of the compressed gas.

In a second embodiment the present invention provides a firearm device

including (a) a replaceable source of compressed gas; and (b) a barrel including

(i) a chamber for containing a piston; (ii) a piston for receiving the compressed

gas source and for cycling the action; (iii) a primer simulator; and (iv) a firing

pin for readily facilitating striking the primer simulator, the firing pin connected

to the piston.

In a third embodiment the present invention provides a method of firing

a firearm device including the steps of; (a) providing a firearm device, wherein

the firearm device includes (i) a source of compressed gas; (ii) a mechanism for

releasing the source of compressed gas; and (iii) a piston configured to readily

facilitate cycling the piston's response to force of the compressed gas; and (b)

pulling trigger of the firearm device readily facilitating the following steps (i)

striking by firing pin of a primer simulator; (ii) releasing of compressed gas

from a magazine containing the compressed gas into the piston; (iii) cycling

and recoil of the piston resulting from pressure of the compressed gas; and (iv)

releasing of the compressed gas from the piston.

In a preferred embodiment the compressed gas is air.

In a preferred embodiment the firearm device further includes a

magazine. Preferably the magazine contains the source of compressed gas.

In a preferred embodiment the magazine includes at least one gas pipe.

In a preferred embodiment the firearm device further includes a chamber

for containing the piston. In a preferred embodiment the piston includes (a) a plurality of vents for

readily facilitating compressed gas to flow into the piston from the chamber for

containing the piston; (b) a plurality of gas outlets for releasing the compressed

gas; and (c) a shoulder for readily preventing the piston from being ejected.

In a more preferred embodiment the piston includes (a) a left side of

piston, which is smaller than the chamber aperture; (b) a plurality of gas

feelers; and (c) at least one gas inlet configured to readily facilitate gas flow

from the magazine containing the source of compressed gas.

In a preferred embodiment the pressure of the compressed gas in the

piston is from about 150 atmospheres to about 200 atmospheres.

In a preferred embodiment the pressure of the compressed gas in the

piston displaces a slide.

In a preferred embodiment the at least one gas pipe readily facilitates

flow of the compressed gas source into the chamber for containing the piston.

In a preferred embodiment the mechanism for releasing the source of

compressed gas includes (a) a primer simulator located at one end of the

chamber for containing the piston; (b) a firing pin configured to readily

facilitate striking of the primer simulator and releasing of the source of

compressed gas; and (c) an gas pipe configured to release source of compressed

gas from the magazine.

In a preferred embodiment the firing pin is selected from the group

consisting of internal firing pin, external firing pin or a combination thereof.

In a preferred embodiment the firearm device is for use in combination with any firearm.

In a preferred embodiment the firearm device is reusable.

In a preferred embodiment the firearm device is for use in firearm

simulation training.

In a preferred embodiment the source of compressed gas is replaceable.

In a preferred embodiment the firearm device further includes a trigger.

In a preferred embodiment the firearm device further includes (a) a duct;

and (b) a disc with hole. Preferably, the piston includes (a) a proximal piston

end, which is proximal to duct and which is smaller than the chamber aperture;

(b) a plurality of gas sealers to prevent gas escaping; and (c) at least one gas

inlet hole configured to readily facilitate gas flow from the magazine containing

the source of compressed gas. Preferably, the mechanism for releasing the

source of compressed gas includes (a) a primer simulator located at an

extremity of the piston; (b) a firing pin configured to readily facilitate striking

of the primer simulator and releasing of the source of compressed gas; (c) an

gas pipe configured to release source of compressed gas from the magazine to

the chamber; and (d) an gas inlet in the piston for gas to flow from the chamber

into the piston.

In a fourth embodiment the present invention provides a firearm device

including (a) a hydraulic source of compressed fluid; (b) a mechanism for

releasing the source of compressed fluid; and (c) a hydraulic piston configured

to readily facilitate cycling the piston's response to force of the compressed

fluid. Preferably, the fluid is water. In a preferred embodiment the mechanism for releasing the source of compressed fluid includes (a) a primer simulator

located at one end of a chamber for containing the piston; (b) a firing pin

configured to readily facilitate stri-king of the primer simulator and releasing of

the source of compressed fluid; and (c) an actuator for readily displacing the

firing pin, such that the primer simulator simulates the action of a primer.

The term 'compressed gas' as used herein, includes but is not limited to

gas at a higher pressure than atmospheric pressure.

The term 'gas' as used herein, includes, but is not limited to any suitable

gas or combination of gases, including, but not limited to air, nitrogen, oxygen,

argon and carbon dioxide. Preferably, the term 'gas' as used herein is air.

The term 'piston' as used herein includes but is not limited to a

cylindrical element that slides to and fro in a hollow container.

The term 'magazine' as used herein, includes, but is not limited to a

case, usually metal for holding cartridges, ammunition, or any other cartridge

simulation element employed in firearms. The term includes integral magazines

and replaceable magazines.

The term 'slide' as used herein, includes, but is not limited to a firearm

element, which displaces back along a surface as a result of the firearm being

used.

The term 'firing pin' as used herein, includes, but is not limited to an

elongated metallic element for readily displacing and/or impacting a primer

and/or primer simulator.

The term 'primer simulator' as used herein, includes, but is not limited to an element, which when hit initiates the firing process of the firearm causing

the compressed gas to flow out of the magazine. The term includes affecting an

initial input to set a process going

The term 'cycling' as used herein, includes, but is not limited to an

action of a weapon, such that the weapon performs at least one cycle of loading

and firing.

The term 'recoil' as used herein, includes, but is not limited to the action

of the firearm jerking backwards, as a result of firing of the firearm.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is herein described, by way of example only, with

reference to the accompanying drawings, wherein:

FIG. 1 shows a schematic view of a first embodiment of the firearm

device of the present invention;

FIG. 2 shows a schematic view of the piston of a first embodiment of the

present invention;

FIG. 3 shows a schematic view of a second embodiment of the firearm

of the present invention; and

FIG. 4 shows a schematic cross section of the piston mechanism of a

preferred embodiment of the firearm of the present invention;

FIG. 5 shows a schematic view of a preferred embodiment of the present

invention before the firearm is fired; and FIG. 6 shows a schematic view of a preferred embodiment of the present

^• f^'t. invention after the firearm has been fired.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention relates to a firearm device. In particular, it

piston unit is accommodated by the barrel unit. Moreover the present invention

is of a firearm, which employs compressed gas to simulate cycle and recoil.

The firearm device of the present invention is geared towards a

multiplicity of different users including, but not limited to the police force,

army, security groups and firearm sportsmen.

The principles and operation of a firearm device, according to the

present invention may be better understood with reference to the drawings and

the accompanying description. The figures are not limiting.

Figure 1 shows a schematic view of a first embodiment of the firearm

device of the present invention 10. As can be see in Figure 1, firearm device 10

includes a source of compressed gas 11, a mechanism 12 configured to release

gas from the source of compressed gas, and a piston 14 configured to readily

facilitate cycling piston 14 in response to force of the compressed gas.

Preferably, firearm device of the present invention 10 features a barrel 13, a

magazine 15, a firing pi 16, a chamber 18 for readily accommodating a piston,

a piston 14 and a plurality of vents 20.

Preferably, magazine 15 contains source of compressed gas 11. Preferably, source of compressed gas 11 is replaceable. Preferably, compressed

gas is compressed air. Preferably, compressed gas 11 replaces the use of live

ammunition in the device of the present invention 10. Magazine 15 is made

from any suitable material, such as aluminum, steel, stainless steel, alloy and

the like. Preferably, magazine 15 is reusable and can be reused substantially

indefinitely.

Mechanism 12 for releasing gas from source of compressed gas 11

includes a firing pin 16, a primer simulator 21 and a gas pipe 22. Firing pin 16

is made from any suitable material. Preferably, when firing pin 16 strikes

primer simulator 21, which is situated at a far end of chamber 18 for readily

accommodating piston, compressed gas 11 from magazine 15 flows out of

magazine 15 through gas pipe 22.

Compressed gas 11 flows through vents 20 into chamber 18 and into

piston 14. Gas pressure builds up in piston 14. Preferably, a pressure of about

150 to about 200 atmospheres is produced. Preferably, the resulting pressure of

the compressed gas displaces piston 14 rearward, thereby cycling the action and

simulating how a gun with live ammunition works. Preferably, compressed gas

11 is released by at least one gas release valve 28. Optionally, the cycling

action can produce a sound or be silent.

The device of the present invention 10 can be made from any regular

firearm, by replacing the barrel and magazine with barrel 13 and magazine 15

of the present invention.

The device of the present invention 10 can be used in any type of gun simulation training or maneuver, such as a two sided drill, whereby one person

^■ - .^{■ ■ •}τ.! r can aim and fire a gun at a second person. ,

In an alternative embodiment, the firearm device of the present invention

10 works using a hydraulic mechanism, whereby compressed gas 11 is replaced

with fluid, such as water. Optionally, any firing pin 16 can be used. Figure 1

shows an external firing pin 16. When firing pin 16 strikes primer simulator 24,

which is situated at a far end of chamber 18 for readily accommodating

hydraulic piston 14, an actuator (not shown in figure 1) readily facilitates flow

of fluid from magazine 15 through vents 20 into chamber 18 and into piston 14.

Piston 14 is preferably a hydraulic piston. Fluid pressure builds up in piston 14.

The resulting pressure of the fluid displaces piston 14 rearward, thereby cycling

the action and simulating how a gun with live ammunition works. Optionally,

the fluid is released via at least one fluid outlet 28. Optionally, the cycling

action can produce a sound or be silent.

Figure 2 shows a schematic view of a piston 14 of a first embodiment of

the firearm device of the present invention 10. As can be see in Figure 2, piston

14 features a piston body 30. Piston body 30 includes a plurality of vents 20

and gas outlets 28 and a shoulder 32 for readily limiting lateral displacement of

piston 14. Preferably, when primer simulator (not shown in figure 2) has been

struck, gas is pushed out of magazine (not shown in figure 2) through plurality

of vents 20 into piston 14, which is accommodated by a chamber to

accommodate a piston (not shown in figure 2). Piston 14 is configured to

readily be displaced backwards and forwards. Shoulder 32 prevents piston 14 from being ejected from chamber. Compressed gas is subsequently released

from piston 14 by way of gas outlets 28. Body of piston can be made from any

suitable material, such as aluminum, steel, stainless steel, tungsten carbide,

reinforced carbon fiber, iron and the like.

Figure 3 shows a schematic view of a second embodiment of the firearm

device 40 of the present invention utilizing a hamπierless internal firing pin

( mechanism 49. As can be seen in figure 3, firearm device 40 includes a source

of compressed gas 45, a mechanism 46 for releasing gas from source of

compressed gas, and a piston 47 configured to readily facilitate cycling a slide

58 in response to force of compressed gas 45. Firearm device 40 features a

barrel 42, a magazine 44, a firing pin 49, a chamber 48 for readily

accommodating a piston, a piston 47, a primer simulator 52 and a plurality of

vents 54.

Preferably, magazine 44 contains compressed gas 45. Preferably, source

of compressed gas 45 is replaceable. Preferably, compressed gas 45 replaces

the use of live ammunition in the device of the present invention 40. Magazine

44 is made from any suitable material. Preferably, magazine 44 is reusable and

can be reused indefinitely. More preferably, magazine 44 includes a valve 41

for readily facilitating filling magazine 44 with compressed gas.

Mechanism 46 for releasing source of compressed gas 45 includes a

firing pin 49, a primer simulator 52 and a gas pipe 56. Firing pin 49 is made

from any suitable material. In the embodiment shown in figure 3, firing pin 49

is a hammerless internal firing pin 49. When firing pin 49 strikes primer simulator 52, which is situated at a far end of piston 47, compressed gas 45

from magazine 44 flows through gas pipes 56. !

Compressed gas 45 flows via vents 54 into chamber 48 and into piston

47. Pressure builds up in piston 47. Preferably, a pressure of about 150 to about

200 atmospheres is produced. Preferably, the resulting pressure of the

compressed gas displaces slide 58 rearward, thereby cycling the action and

simulating how a gun with live ammunition works. Preferably, compressed gas

45 is released by at least one gas release valve 60. Optionally, the cycling

action can produce a sound or be silent.

The device of the present invention 40 can be made from any regular

firearm, by replacing the barrel and magazine with barrel 42 and magazine 44

of the present invention.

The device of the present invention 40 can be used in any type of gun

simulation training or maneuver, such a two sided drill, whereby one person

can aim and fire a gun at a second person.

In an alternative embodiment, the firearm device of the present invention

40 works using a hydraulic mechanism, whereby the compressed gas is

replaced with fluid, such as water. When firing pin 49 strikes primer simulator

52, which is situated at a far end of chamber for readily accommodating

hydraulic piston 47, an actuator (not shown in figure 3) readily facilitates flow

of fluid from magazine 44 through vents 54 into chamber 48 and into piston 47.

Fluid pressure builds up in piston 47. The resulting pressure of the fluid

displaces slide 58 rearward, thereby cycling the action and simulating how a gun with live ammunition works. The fluid is released via at least one fluid

outlet 60. Optionally, the cycling action can produce a sound or be silent.

Preferably, the firearm device of the present invention 40 is used by a

user in the following way. User activates trigger 62, by any suitable action

preferably by pulling trigger 62. Pulled trigger 62 readily facilitates firing pin

49 striking primer simulator 52. Preferably, the action of primer simulator 52

being hit causes flow of gas 45 from magazine 44 through gas pipe 56 into

chamber 48 and through vents 54 into piston 47. Gas pressure builds up in

piston 47, causing cycling of action and displacement of slide 58 rearward,

simulating recoil. Gas 45 escapes from piston 47 through gas outlets 60.

Alternatively, compressed gas 45 readily flows into piston 47 and

pulling trigger 62 facilitates piston 47 to be displaced rearwards, thereby

displacing slide 58 and cycling an action.

Figure 4 shows a schematic view of the piston mechanism 70 of a

preferred embodiment of the firearm of the present invention. As can be seen in

figure 4, barrel 72 preferably, includes at least two barrel sections 74 and 76.

Preferably, at least two barrel sections 74 and 76 are tapped, wherein

preferably, forward barrel section 74 is readily configured to be screwed into

chamber barrel section 76.

Forward barrel section 74 includes a duct 78. In a most preferred

embodiment, duct 78 has a diameter of about 3mm to about 5mm and a length

of about 20mm to about 35mm. A protrusion 80, which is preferably, attached

to or integrally formed with a piston 82 is accommodated by a disc 84 with a hole 86 formed in disc 84 and readily accommodated and situated in adjacency

^{■ ■}?' ^■ . - -.- ^■ .^, - .._τ ,. to duct aperture 88 formed at an end of duct 78. ι

.. Chamber barrel section 76 features a chamber 90 for readily

accommodating a piston 82 and a gas pipe 92, through which gas flows from a

magazine containing a source of compressed gas 91.

Optionally, when barrel 72 is unscrewed into two sections 74 and 76,

piston mechanism 82 and disc 84 are inserted. Piston mechanism 82 includes a

proximal piston end 92, which is proximal to duct 78 and which is larger then

chamber aperture 94. Due to the size restriction, piston 82 is unable to displace

to the right beyond a certain degree. Preferably, piston end 92 features a

shoulder 93. Piston 82 features a plurality of air sealers 96, which are

configured to prevent gas escaping. Piston 82 includes at least one hole 97,

which is readily restricted by a counter shoulder 95, through which gas, which

flows into chamber through gas pipe 92 enters piston 82. Piston 82 further

features primer simulator 98, which is located at distal piston end 99, wherein

distal piston end 99 is distal in relation to duct 78.

Figure 5 shows a schematic view of a preferred embodiment of the

firearm device 100 of the present invention before the firearm has been fired.

As can be seen in figure 5 firearm device 100 includes a source of compressed

gas 102, a mechanism 104 configured to release the gas 102, and a piston 106

configured to readily facilitate cycling a slide 107 in response to force of the

compressed gas 102.

Firearm device of the present invention 100 preferably, features a barrel 108, a magazine 110, ,a firing pin 112, a chamber 114 for, readily

accommodating a piston, a piston 106, duct 116 and a trigger 117.

Preferably, magazine 110 contains source: of compressed gas 102.

Preferably, compressed gas is air. Preferably, source of compressed gas 102 is

- - . > replaceable. Preferably, compressed gas 102 replaces the use άf ■ live

ammumtion in the device of the present invention 100. Magazine 110 is made

from any suitable material. Preferably, magazine 110 is reusable and can be

reused substantially indefinitely.

A primer simulator 118, is preferably, attached or integrally formed with

piston 106. Preferably, cycling of the mechanism of firearm device of the

present invention 100 is initiated when trigger 117 is pulled, thereafter firing

pin 112 strikes primer simulator 118, which is situated at a far end of piston

106. Thereafter, air from piston 106 flows against a disc 125. Thus creating a

counter force for readily displacing piston 106 and slide 107 rearward. Piston

106 includes a proximal piston end 120, which is proximal to duct 116 and

which is larger then chamber aperture 122. Due to the size restriction, piston

106 is unable to displace beyond a certain degree. Preferably, piston end 120

features a shoulder, which is readily restricted by a counter shoulder. Piston

106 features a plurality of air sealers 124, which are configured to prevent gas

escaping. Piston 106 is attached to disc 125 with a hole 126, formed in disc 125

for readily accommodating and readily accommodated and situated in

adjacency to duct 116.

Mechanism 104 for releasing source of compressed gas 102 includes a gas pipe 127 for gas to freely flow from magazine 110 to chamber 114, at least

one air hole 128 in piston 106 facilitated gas to enter and flow through piston

106 and an air outlet 129 in duct for gas to escape out of barrel 108 after firing.

Preferably, compressed air freely flows in the preferred embodiment of the

invention.

Before trigger 117 is pressed protrusion (not shown in figure 5), which

is preferably, attached to or integrally formed with piston 106 is accommodated

by disc 125 with hole 126. Preferably, a bias 115 applies sufficient force and/or

pressure to situate piston 106 substantially against disc 125.

When trigger 117 is pressed, firing pin 112 displaces laterally, striking

primer simulator 118 and displaces primer simulator 118 forward.

Figure 6 shows a schematic view of a preferred embodiment of the

firearm device 130 of the present invention after the firearm has been fired. As

can be seen in figure 6 firearm device 130 includes a source of compressed gas

132, a mechanism 134 configured to release the source of compressed gas 132,

- and a piston 136 configured to readily facilitate cycling a slide 156 in response

to force of the compressed gas 132.

Compressed gas 132, which is flowing through gas pipe 144 between

duct 146 and piston 136 flows through hole 148 into piston 136 and a plurality

of air sealers 150 attached to piston 136, prevent gas from escaping. After a

trigger 138 is pressed, a firing pin 140 displaces laterally, thereby striking a

primer simulator 142 and pushing primer simulator 142 forward. Flow of gas in

piston 136 pushes against disc 152 with hole 154, which causes a blow back action resulting in piston 136 displacing to the right and slide 156 displacing to

the right. Preferably, piston 136 displaces substantially 1mm to 7mm, thereafter

gas escapes through hole 154 into duct 146 and out of barrel exit 158.

Preferably, a bias 159, which is located in adjacency to barrel 160, applies

force and/or pressure sufficient to displace slide 156 back to its original

position. Optionally, the cycling action can produce a sound or be silent.

It will be appreciated that the above descriptions are intended only to

serve as examples, and that many other embodiments are possible within the

spirit and the scope of the present invention.

Claims

WHAT IS CLAIMED IS:

1. A firearm device comprising

(a) a source of compressed gas;

(b) a mechanism for releasing said source of compressed gas; and

(c) a piston configured to readily facilitate cycling said piston's

response to force of said compressed gas.

2. The firearm device of claim 1, further comprising a magazine.

3. The firearm device of claim 1, wherein said compressed gas is

air.

4. The firearm device of claim 2, wherein said magazine contains

said source of compressed gas.

5. The firearm device of claim 2, wherein said magazine comprises

at least one gas pipe.

6. The firearm device of claim 1, further comprising a chamber for

containing said piston.

7. The firearm device of claim 1, wherein said piston comprises

(d) a plurality of vents for readily facilitating compressed gas to

flow into said piston from said chamber for containing said

piston;

(e) a plurality of gas outlets for releasing said compressed gas;

and

(f) a shoulder for readily preventing said piston from being

ejected.

8. The firearm device of claim 7, wherein the pressure of said

compressed gas in said piston is from about 150 atmospheres to

about 200 atmospheres.

9. The firearm device of claim 8, wherein said pressure of said

compressed gas in said piston displaces a slide.

10. The firearm device of claim 5, wherein said at least one gas pipe

readily facilitates flow of said compressed gas source into said

chamber for containing said piston.

11. The firearm device of claim 1, wherein said mechanism for

releasing said source of compressed gas comprises (d) a primer simulator located at an extremity of said piston;

(e) a firing pin configured to readily facilitate striking of said primer

simulator and releasing of said source of compressed gas; and

(f) a gas pipe configured to release source of compressed gas from

said magazine.

12. The firearm device of claim 11, wherein said firing pin is selected

from the group consisting of internal firing pin, external firing pin

or a combination thereof.

13. The firearm device of claim 1, for use in combination with any

firearm.

14. The firearm device of claim 1, wherein said firearm device is

reusable.

15. The firearm device of claim 1, for use in firearm simulation

framing.

16. The firearm device of claim 1, wherein said source of compressed

gas is replaceable.

17. The firearm device according to claim 1, further comprising a trigger.

18. A firearm device comprising

(a) a replaceable source of compressed gas; and

(b) a barrel comprising

(i) a chamber for containing a piston;

(ii) a piston for receiving said compressed gas source

and for cycling the action;

(iii) a primer simulator; and

(iv) a firing pin for readily facilitating striking said

primer simulator, said firing pin connected to said

piston.

19. The firearm device of claim 18, wherein a magazine contains said

source of compressed gas.

20. The firearm device of claim 19, wherein said magazine comprises

at least one gas pipe.

21. The firearm device of claim 18, wherein said piston comprises

(c) a plurality of vents for readily facilitating compressed gas

to flow into said piston from said source of compressed

gas;

(d) a plurality of gas outlets for releasing said compressed gas;

and

(e) a shoulder for readily preventing said piston from being

ejected.

22. The firearm device of claim 18, further comprising (c) a duct;

and (d) a disc with hole.

23. The firearm device of claim 22, wherein said piston comprises

(e) a proximal piston end, which is proximal to duct and which

is smaller than said chamber aperture;

(f) a plurality of air sealers to prevent gas escaping; and

(g) at least one gas inlet hole configured to readily facilitate

gas flow from said magazine containing said source of

compressed gas.

24. The firearm device of claim 22, wherein said mechanism for

releasing said source of compressed gas comprises

(e) a primer simulator located at an extremity of said piston;

(f) a firing pin configured to readily facilitate striking of said primer

simulator and releasing of said source of compressed gas;

(g) a gas pipe configured to release source of compressed gas from

said magazine to said chamber; and

(h) a gas inlet in said piston for gas to flow from said chamber into

said piston.

25. The firearm device of claim 18, wherein the pressure of said

compressed gas in said piston displaces a slide.

26. The firearm device of claim 20, wherein said at least one gas pipe

readily facilitates flow of said compressed gas source into said

chamber for containing said piston.

27. The firearm device of claim 18, wherein said mechanism for

releasing said source of compressed gas comprises

(c) a primer simulator located at one end of said chamber for containing said piston; and

^■■ i γi

(d) a firing pin configured to readily facilitate striking of said

primer simulator and releasing of said source of

compressed gas.

28. A method of firing a firearm device comprising the steps of;

(a) providing a firearm device, wherein said firearm device

comprises

(i) a source of compressed gas;

(ii) a mechanism for releasing said source of

compressed gas; and

(iii) a piston configured to readily facilitate cycling said

piston's response to force of said compressed gas;

and

(b) pulling trigger of said firearm device readily facilitating the

following steps

(i) striking by firing pin of a primer simulator; (ii) releasing of compressed gas from a magazine

containing said compressed as into said piston;

(iii) cycling and recoil of said piston resulting from

pressure of said compressed gas; and

(iv) releasing of said compressed gas from said piston.

29. A firearm device comprising:

(a) a hydraulic source of compressed fluid;

(b) a mechanism for releasing said source of compressed fluid; and

(c) a hydraulic piston configured to readily facilitate cycling said

piston's response to force of said compressed fluid.

30. The firearm device of claim 29, wherein said fluid is water.

31. The firearm device of claim 29, wherein said mechanism for

releasing said source of compressed fluid comprises

(d) a primer simulator located at one end of a chamber for containing

said piston; (e) a firing pin configured to readily facilitate striking of said primer

simulator and releasing of said source of compressed fluid; and

(f) an actuator for readily displacing said ---ring pin, such that said

primer simulator simulates the action of a pπmer.

32. The firearm device according to any one of claims 1-27, 29-31,

substantially as herein described and with reference to the figures.

33. The method according to claim 28, substantially as herein

described and with reference to the figures.