Above is a video on AR15 rifle tested firing after submerged from underwater. It is said that rifle explode because it did not use piston driven as AK's.
AR15 or Armalite 15 is a prototype rifle for M16 and M4.
M16 & M4 used the same mechanism what we called a direct gas impingement. The basic concept is when firing a bullet, it will cause a high pressure gas which that gas pressure is used to operate the mechanical inside the rifle.
1.Some of the gas is being trapped and flowed back through a gas tube.
2.Then the high pressure gas pushed the bolt the bolt and carrier backward
towards the rifle butt.
3.As it moves the bolt begins to turn and unlock from the barrel extension.
4.When it is fully unlocked it begins its rearward movement along with the bolt carrier.
5.The cam pin is part of the bolt's rotation as it follows a groove cut into the carrier that twists and forces the bolt to unlock. Once the bolt is unlocked, the bolt carrier and bolt continue to move toward the butt of the gun and the new bullet from magazine is extracted while the empty case is ejected .
6.Behind the bolt carrier is a plastic or metal buffer which rests in line with a return spring that pushes the bolt carrier back toward the chamber.
7.A groove machined into the upper receiver traps the cam pin and prevents it and the bolt from rotating into a closed position.
8. The bolt's locking lugs then push a fresh round from the magazine which is guided by feed ramps into the chamber. As the bolt's locking lugs move past the barrel extension, the cam pin is allowed to twist into a pocket milled into the upper receiver. This twisting action follows the groove cut into the carrier and forces the bolt to twist and “lock” into the barrel’s extension
The conclusion is do not fire a waterlogged AR15.
(referance: http://en.wikipedia.org/wiki/AR-15)
1 comment:
As water or a fluid cannot expend, surely the high pressure from the gases formed after the cartrige being expended,the gases has to escape and it exert immense pressure from within the wall of the M4 rifle. As water could have now momentarily blocked the barrel too,the breech block when travelling in the rearward motion, may have hit the 'housing' with such great force causing a structural failure.No rifle or shotgun in the world are recommended to undergo such test or could survive from being seriously damaged in similar test.Common sense will prevail if a soldier had submerged his weapon in water, he should quickly ensure his weapon is 'cleared' of the water, especially the barrel, before commencing firing the weapon.A blocked gun barrel from mud,rag or water means disaster for the user, if a shot is fired.
Post a Comment