Patent ID: 7213498
Filing Date: 2007-05-08
Classification: F41A,F41C

Abstract:
1. In a rifle having an upper receiver carrying a bolt carrier and a barrel attached to the upper receiver, a lower receiver coupled to the upper receiver, the bolt carrier having a locked position and an open position, a buffer system comprising: an elongated compression spring positioned in a tubular extension member having a closed end, and an open end attached to the lower receiver so as to be in abutting engagement with the bolt carrier; a partially fluid filled cylinder fixedly attached to a first coil of the spring; a piston reciprocally mounted within the cylinder for movement between a first position and a second position, the piston including a connecting shaft having an end contacting the closed end of the extension member upon compression of the spring, the piston being formed so that the fluid in the cylinder restricts movement of the piston toward the first position and allows substantially free movement of the piston toward the second position; the piston being mounted so that compression of the spring by movement of the bolt carrier from the locked position to the open position moves the piston in the cylinder toward the first position and expansion of the spring moves the bolt carrier from the open position to the locked position and moves the piston in the cylinder toward the second position, and a ring coupled to another coil of the spring spaced from the first coil, the ring engaging the end of the connecting shaft during expansion of the spring and permitting movement of the end during compression of the spring.