Adjustable carrier
Disclosed herein is a modified rifle bolt carrier allowing a selectively openable vent/valve at the location where exhaust gas is pressurizing the bolt carrier to control carrier speed under suppressed fire in a first valve position or unsuppressed fire in a second valve position. A valve core is disclosed which may be rotated 180° to a first “open” setting for non-suppressed fire from its position in a “closed” position for suppressed fire, and a third “median” position. The modified bolt carrier will allow an operator of the firearm to adjust for a suppressor without changing the gas block or having to modify or adapt the front end or barrel end of the firearm.
1. A firing assembly for a firearm, the assembly comprising:
a bolt carrier having a longitudinal axis, a surface defining a gas port, an inner chamber;
the inner chamber configured to be in fluid communication with a gas block via a gas conduit;
a surface of the firing assembly defining a valve housing, the valve housing intersecting the gas conduit;
a valve core having an outer surface immediately adjacent the valve housing;
the valve core configured to rotate within the valve housing;
the valve core having a first lateral end larger in diameter than the valve housing;
a sealing member pressed between the first lateral end of the valve core and the valve housing;
the valve core comprising a valve port surface which selectively controls gas flow thorough the gas conduit;
a second lateral end of the valve core comprises a radially protruding component; and
wherein the radially protruding component of the valve core contacts a surface of the bolt carrier to bias the sealing member against the valve housing.
2. The assembly as recited in claim 1 wherein the outer surface of the valve core is in close sliding fit to the valve housing so as to rotate therein.
3. The assembly as recited in claim 2 wherein:
the outer surface of the valve core provides additional rotational friction to rotation of the valve core within the valve housing.
4. The assembly as recited in claim 3 a sealing member:
the sealing member configured to bias the valve core laterally.
5. The assembly as recited in claim 1 wherein:
the outer surface of the valve core is substantially cylindrical;
the valve port surface is detented from the outer surface of the valve core; and
wherein the valve port surface is selectively aligned with the gas conduit of the bolt carrier when the firearm is in an unsuppressed position such that the valve core does not substantially occlude the gas port.
6. The assembly as recited in claim 5 further comprising:
a valve depressed surface on the valve body;
the valve depressed body radially opposed to the valve port surface relative to the substantially cylindrical outer surface of the valve core.
7. The assembly as recited in claim 5 wherein;
the radially protruding component is configured to index rotation of the valve core within the valve housing when the valve port surface is selectively aligned with the gas conduit in an unsuppressed position, suppressed position, or median position.
8. The assembly as recited in claim 1 further comprising:
a tool engagement surface on the valve core;
the tool engagement surface is not circular; and
a tool having a surface to cooperate with the tool engagement surface so as to selectively provide rotational force to the valve core when the tool is rotated.
9. The assembly as recited in claim 1 further comprising a sealing member radially compressed between the valve core and the valve housing.
10. The assembly as recited in claim 9 wherein the sealing member comprises an O-ring.
11. The assembly as recited in claim 10 wherein the O-ring engages a circumferential groove in the valve core.