Firearm Systems and Methods

摘要

A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is larger than that of a standard M16/M4. A bolt carrier can have a bolt that has a double cut cam having an unlocking cam surface that has sufficient dwell increase to delay a start of unlocking when the bolt carrier is used in an M4 carbine. A stepped extractor pin may be provided that prevents disengagement of the extractor pin. A tube can be configured to provide gas from a barrel of the firearm to the piston via the carrier key. The tube can have a heat radiator formed from triangular shaped threads on at least a portion of the tube. A piston on the bolt and can have a plurality of rings including pairs of mating rings that are formed and maintained as a matched pair.

主权项

1. A pair of mating rings, configured to cooperate with a piston of a gas operated firearm to mitigate gas leakage past the piston, comprising:
a key formed on each ring of the pair; and a gap formed in each ring of the pair and configured to receive the key of the mating ring; wherein the pair of mating rings are a matched set such that each key has a height that is equal to a thickness of its mating ring; and wherein the gap of each ring spans a greater angular distance, in a direction around the ring, than a width of the key of each ring.