Patent attributes
A delayed blowback device preferably includes a bolt, a gas key and at least one spring-loaded projection. A projection slot or projection pocket traverses a bottom of the gas key, which are sized to receive a width of the spring-loaded projection. The spring-loaded projection could have a round outer perimeter or a D-shaped outer perimeter. A location of the projection slot along a length of the gas key is such that the projection contacts a cam pocket in an inner wall of an upper receiver. In a second embodiment, a slide stop in a bottom of the gas key is used to push a projection into the cam pocket. Spring rates may be varied to increase or decrease the firing rate of the firearm. The return speed of the bolt carrier could also be modified by changing a distance between the projection pocket and a rear of the bolt.
