Patent ID: 8869674

Claim:
A gas system for a firearm having a barrel with a bore and a gas port in communication with the bore, the gas system comprising: a gas block coupled to the barrel, the gas block comprising: a gas capture port in communication with the barrel gas port; a pressure sleeve removeably mounted inside the gas block, the pressure sleeve comprising: a gas conduit in communication with the gas capture port; a seat proximal to the gas conduit; a projection; and a rod conduit for communicating gas through the projection; an operating rod movably mounted in the gas block, the operating rod comprising a cup configured to fit over the projection; a valve mountable to the gas block, the valve comprising: a knob coupleable to the gas block; and a plug moveably mountable within the pressure sleeve, the plug having a plunger engageable with the seat to adjust gas flow through the gas conduit to the rod conduit; and a spring mounted around the rod for biasing the rod toward the gas block; wherein gas discharged from a fired cartridge flows through the gas port, the gas capture port, the gas conduit and the rod conduit and against the rod cup to drive the rod to reload the firearm; and the plug is moveable by the knob to a plurality of positions to alter the gas conveyed to the operating rod.