| CPC F41A 3/66 (2013.01) [F41A 11/04 (2013.01); F41C 23/04 (2013.01)] | 5 Claims |

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1. A lower receiver comprising:
a stopper movable between a blocking position and an open position, wherein the stopper prevents rearward movement of a bolt carrier when the stopper is in the blocking position, wherein the stopper allows rearward movement of the bolt carrier when the stopper is in the open position; and
a buffer assembly, wherein the buffer moves the stopper to the open position when the assembly is in a locked position.
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