Gas-operated firearm with pressure compensating gas piston

摘要

A gas operating system for a firearm renders the firearm capable of firing a wide range of shot loads by passively or automatically compensating for different shot loads. The firearm includes a plurality of ports formed in the firearm barrel, and corresponding ports formed in a gas block of the gas operating system. The ports tap gases generated during firing which are used to cycle the firearm. When firing different cartridge loads, differing combinations of the ports are selectively at least partially blocked or otherwise obstructed by the cartridge casing according to the size of the cartridge. Additionally, the gas operating system includes compensating gas pistons with internal relief valves that can bleed off excess gas to compensate for larger shot loads regardless of the size of the cartridge.

主权项

1. A gas operating system for a firearm, comprising:
a gas block comprising a longitudinal piston bore; a compensating gas piston at least partially disposed in the longitudinal piston bore, the compensating gas piston comprising a piston body that is movable along the longitudinal piston bore, a gas pressure relief valve disposed internally within the piston body; and a diverter portion extending into the longitudinal piston bore, wherein the compensating gas piston is movable along the longitudinal piston bore to selectively contact a stop end of the diverter portion; wherein as the piston moves along the piston bore in response to the pressurized gases from firing entering the piston bore, the relief valve of the piston enables excess gases to be diverted through the piston body to reduce pressure acting on the piston and reduces bolt velocity during cycling of the bolt.