A firearm includes a barrel having a breech end. A receiver is engaged with the breach end of the barrel and defines a chamber. A vent path is through the barrel downstream from the breech end. A latch is downstream from the vent path. A bolt is at least partially inside the chamber. The bolt has a locked position to prevent the bolt from moving away from the breech end of the barrel and a released position that allows the bolt to move away from said breech end of the barrel.
1. A firearm, comprising:
a barrel;
a breech end of said barrel;
a receiver engaged with said breach end of said barrel, wherein said receiver defines a chamber;
a vent path through said barrel downstream from said breech end;
a latch downstream from said vent path; and
a bolt at least partially inside said chamber;
wherein said bolt has a locked position to prevent said bolt from moving away from said breech end of said barrel and a released position that allows said bolt to move away from said breech end of said barrel.
2. The firearm as in claim 1 , wherein said bolt is biased toward said breech end of said barrel.
3. The firearm as in claim 1 , further comprising means for biasing said latch to engage with said bolt.
4. The firearm as in claim 1 , further comprising a trigger engaged with said bolt when said bolt is in said released position.
5. The firearm as in claim 1 , further comprising a firing pin at least partially inside said bolt.
6. The firearm as in claim 5 , further comprising a trigger engaged with said firing pin when said bolt is in said locked position.
7. The firearm as in claim 5 , wherein said firing pin is biased away from said breech end of said barrel.
8. A firearm comprising:
a barrel;
a muzzle end of said barrel;
a breech end of said barrel upstream from said muzzle end;
a receiver engaged with said breach end of said barrel;
a bolt slidingly engaged with said receiver;
a vent path through said barrel upstream from said muzzle end and downstream from said breech end; and
a latch downstream from said vent path;
wherein said latch has a locked position in which said latch prevents said bolt from moving away from said breech end of said barrel and a released position in which said latch allows said bolt to move away from said breech end of said barrel.
9. The firearm as in claim 8 , wherein said latch is biased toward said locked position.
10. The firearm as in claim 8 , further comprising a trigger engaged with said bolt when said latch is in said released position.
11. The firearm as in claim 8 , further comprising a firing pin at least partially inside said bolt.
12. The firearm as in claim 11 , further comprising a trigger engaged with said firing pin when said latch is in said locked position.
13. The firearm as in claim 11 , wherein said firing pin is biased away from said breech end of said barrel.