Firearm Delay Mechanism

Abstract

In some embodiments, a firearm comprises a lower receiver, a bolt carrier and a weight. The lower receiver is arranged to support a hammer and an auto-sear. The bolt carrier comprises a body and a striker moveable with respect to the body between a first position and a second position. The body defines a first cavity adjacent the striker. A weight is positioned in the first cavity and arranged to move the striker to the second position, wherein the striker is arranged to operate the auto-sear.

1 . A firearm mechanism comprising:
 a hammer;   an auto-sear;   a bolt carrier comprising a body and a striker moveable with respect to the body between a first position and a second position, the striker biased to the first position by a biasing mechanism;   the striker not contacting the auto-sear in the first position, the striker contacting the auto-sear in the second position.   
     
     
         2 . The firearm mechanism of  claim 1 , comprising a reciprocating weight arranged to move the striker to the second position. 
     
     
         3 . The firearm mechanism of  claim 1 , comprising a pin supported by the bolt carrier, the striker comprising an aperture, a portion of the pin oriented in the aperture. 
     
     
         4 . The firearm mechanism of  claim 3 , the biasing mechanism comprising a spring arranged to contact the pin. 
     
     
         5 . The firearm mechanism of  claim 1 , the bolt carrier body defining a cavity adjacent to the striker. 
     
     
         6 . The firearm mechanism of  claim 5 , the striker comprising a wall portion of the cavity. 
     
     
         7 . The firearm mechanism of  claim 5 , comprising a weight, the weight moveable with respect to the bolt carrier, the weight arranged to operate the auto-sear. 
     
     
         8 . The firearm mechanism of  claim 7 , comprising a buffer adjacent to the bolt carrier, the buffer comprising a buffer cavity, the firearm mechanism comprising an orientation wherein the weight is in the buffer cavity. 
     
     
         9 . The firearm mechanism of  claim 8 , wherein the weight travels between the cavity and the buffer cavity during a firing cycle. 
     
     
         10 . The firearm mechanism of  claim 8 , wherein surfaces of the bolt carrier and buffer that contact one another comprise complimentary shapes arranged to self-align the bolt carrier and buffer on a common axis. 
     
     
         11 . The firearm mechanism of  claim 8 , wherein one of the bolt carrier and buffer comprises an inclined surface, and the other of the bolt carrier and buffer comprises a declined surface, the inclined surface arranged to contact the declined surface. 
     
     
         12 . The firearm mechanism of  claim 11 , wherein the inclined surface contacts the declined surface when a central axis of the bolt carrier and a central axis of the buffer are coaxial. 
     
     
         13 . The firearm mechanism of  claim 8 , the buffer comprising a front aperture and a rear bumper. 
     
     
         14 . A firearm comprising:
 a lower receiver arranged to support a hammer and an auto-sear;   a bolt carrier comprising a body and a striker moveable with respect to the body between a first position and a second position, the body defining a first cavity adjacent the striker;   a weight positioned in the first cavity, the weight arranged to move the striker to the second position, the striker arranged to operate the auto-sear in the second position.   
     
     
         15 . The firearm of  claim 14 , the striker biased to the first position by a biasing mechanism. 
     
     
         16 . The firearm of  claim 14 , comprising a buffer adjacent to the bolt carrier, the buffer comprising a second cavity, the weight arranged to travel between the first cavity and the second cavity. 
     
     
         17 . The firearm of  claim 16 , the bolt carrier comprising an opening into the first cavity and the buffer comprising an opening into the second cavity.