Firearm delay mechanism

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; and

a reciprocating weight;

the striker not contacting the auto-sear in the first position, the striker contacting the auto-sear in the second position, the reciprocating weight arranged to move the striker to the second position.

2. The firearm mechanism of claim 1 , comprising a buffer adjacent to the bolt carrier, the buffer comprising a buffer cavity, the reciprocating weight arranged to move in the buffer cavity.

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. 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 body defining a cavity adjacent to the striker; and

a weight moveable with respect to the bolt carrier;

the striker not contacting the auto-sear in the first position, the striker contacting the auto-sear in the second position 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.

18. The firearm of claim 16 , wherein contacting surfaces of the buffer and the bolt carrier comprise complimentary shapes arranged to self-align.

19. The firearm of claim 16 , wherein a rear end of the bolt carrier is chamfered.

20. The firearm of claim 19 , wherein a front end of the buffer is chamfered.