Adjustable gas block for an indirect gas operated firearm

摘要

A firearm including a barrel, receiver, indirect gas system and an adjustable gas block. Four positions of adjustment are provided for on the adjustable gas block, each of which provides a different setting to regulate gas flow into the host firearm's operating system. A position of adjustment is selected based on how the firearm is being used. The provided positions of adjustment are calibrated for the standard use of the host firearm, use of a silencer, use of the firearm under hard or adverse conditions or when it is necessary to increase the firearm's rate of fire, and to block the flow of gas into the operating system. The provided gas block is designed to function with an indirect gas operating system, but could be adapted for use with a direct gas impingement system as well. Excess gas from the operating system is not vented from the gas block thereby eliminating the generation of additional muzzle flash and sound. No tool is required to manipulate the adjustment mechanism of the gas block.

主权项

1. A firearm utilizing an adjustable gas block comprising:
a receiver; a barrel connected to the receiver, said barrel having a gas port; a gas operating system; a nozzle assembly having a front end, back end, and internal void with means to communicate with the barrel and gas operating system through a plurality of ports which are spaced about the front end, said back end being received within and enveloped by a portion of the gas operating system and having an opening in operational communication with said gas operating system; a gas block housing having a barrel receiving channel for a portion of the barrel to be contained therein, a gas nozzle receiving channel having a cylindrical bore which is above and runs parallel to a longitudinal axis of the barrel and the barrel receiving channel, the barrel receiving channel having a port in communication with the barrel, the gas nozzle receiving channel cylindrical bore containing a front portion of the nozzle assembly therein; and said gas block housing further having a groove formed therein to receive a rotatable knob, said groove running transverse to said barrel axis between the front end of the gas nozzle receiving channel cylindrical bore and a generally planar, rearwardly facing portion of said gas block housing; a rotatable knob fitted within said groove and rotatable with respect thereto, said knob having a bore in substantially longitudinal alignment with the gas nozzle receiving channel cylindrical bore, said rotatable knob being coupled to said front portion of said nozzle assembly to retain and control rotational movement of the nozzle assembly.