Bolt carrier system

摘要

A semi-automatic or automatic rifle comprising a barrel attached to and upper receiver and including a compressible bolt carrier extension system. The compressible bolt carrier extension system includes a bolt carrier, an extension spring, two pins, and a reciprocation bolt carrier extension piece. As a whole, the compressible bolt carrier extension system makes possible the use of elongated upper and lower receivers to be used for chambering long-action or other center fire cartridges for use with AR rifles such as the M-16, and M4 etc., eliminating the need for any buffer or buffer tubes other than those commercially available. A further advantage of the compressible bolt carrier extension system is the reduction of felt recoil as the system fully loads during the recoil stroke as it pushes against the buffer absorbing additional recoil energy. The system can be incorporated into firearms using a variety of cartridges.

主权项

1. A bolt carrier system for a firearm, comprising:
a bolt carrier including a first cavity and a first aft end; a bolt carrier extension slidably received within the first cavity of the bolt carrier and including a flange at a second aft end; and a spring coupled to the bolt carrier and the bolt carrier extension, the spring biasing the bolt carrier extension into an extended position with the second aft end of the bolt carrier extension spaced from the first aft end of the bolt carrier, wherein the bolt carrier extension is slidable between the extended position and a retracted position with the flange abutting the first aft end of the bolt carrier.