Patent ID: 8261653

Claim:
A firearm comprising: a barrel; a gas barrel port fluidly coupled with the barrel; a gas jet block fluidly coupled with the barrel gas port, the gas jet block comprising a gas operation tube docking port and a gas jet in the gas operation tube docking port to meter gas flow from the barrel; a gas operation tube fluidly engaged with the gas jet and axially translatable within the docking port; a bolt carrier assembly comprising a carrier and a bolt, the gas operation tube fixedly connected to the carrier and fluidly coupled with the bolt carrier assembly, the bolt carrier assembly movable to axially translate the gas operation tube within the docking port to disengage the gas operation tube from the gas jet as a function of gas pressure in the bolt carrier assembly, the gas jet venting gas from the gas jet block when the gas operation tube disengages from the gas jet; and a spring positioned with respect to the gas operation tube to cause the tube to reengage the gas operation tube with the gas jet.