US Patent 7810423 Gas operated firearm action delay device

The invention relates to a device for delaying the gas action operated firearm. The device includes a gas chamber and an outlet, wherein the outlet is in fluid communication with the action tube of the firearm. The device has a port in fluid communication between the gas chamber and the barrel and a one-way check valve in the port. A gas release valve is included and is disposed on the container and in fluid communication with the gas chamber and the outlet. The device further includes linkage attached to the gas release valve and in mechanical communication with the bolt, such that when the gas release valve is in the closed position, gas is retained in the gas chamber and the linkage blocks the bolt from moving, and when the gas release valve is in the open position the linkage unblocks the bolt permitting normal gas action of the firearm.