Schuster M1A/M14 Adjustable Gas Plug
By adjusting the volume of gas in the cylinder it changes the speed of the op-rod and controls the harmonic vibration of the barrel. Even if you only shoot your M1A once in a while make it last a second lifetime. Schuster M1A adjustable gas plug softens the blows on your op-rod and wear on the bolt lugs. Made from Hardened Tool Steel & Parkerized.