Post Barrel Plenum Operated Gas Cycling System for Automatic Firearms

摘要

A gas buffer plenum positioned at the end of the barrel of an automatic firearm. A barrel side end cap connects the system to the barrel. A plenum tube holds one or more chamber walls and retains gas pressure within the enclosure. A target side end cap creates the final pressure chamber enclosure and is attached to the plenum tube to lock the system together. This gas buffer plenum allows a bullet to leave the barrel of the firearm before the bolt of the firearm starts to open. As the gas buffer plenum is filled with the exploding gas behind the bullet, the gas chambers build and maintain pressure that is then forced back through a hole in the plenum. The gas is forced down a gas tube or into a piston system. Depending on the configuration of the firearm, either the gas force, or the piston, strikes the bolt and cycles the firearm. The system may also be used to retrofit a gas operated firearm that uses a traditional gas block design.

主权项

1. A gas buffer plenum positioned at the end of a firearm barrel to collect, store and direct high pressure gas through a gas tube back to a receiver of the firearm to cycle a bolt of the firearm after the bullet has exited the barrel, the gas buffer plenum comprising:
(a) a plenum enclosure having a barrel oriented end and a target oriented end; (b) a barrel side wall on the barrel oriented end of the plenum enclosure, the barrel side wall comprising:
(i) a center axis barrel collar attachable to the end of the barrel of the firearm;(ii) a center axis bullet inlet port; and(iii) an offset return gas port; (c) a target side wall on the target oriented end of the plenum enclosure, the target side wall comprising a center axis bullet exit port; and (d) at least one chamber wall positioned within the plenum enclosure between the barrel side wall and the target side wall, the at least one chamber wall comprising a center axis bullet pass through port and a concentric buffer wall collecting, storing, and redirecting expanding gas from behind a passing bullet back from the plenum enclosure to the offset return gas port of the barrel side wall; wherein the expanding gas is directed through the return gas port into a gas tube and is conducted to the receiver of the firearm to cycle the bolt.