Did you know that replacing the factory gas block on your AR-15 with an adjustable gas block can improve your rifle’s performance? Such as: -Less recoil, results in a faster follow-up shot. -Less stress on the operating parts. -Less carbon build-up, better reliability and easier cleaning. The concept of an adjustable-gas system has been around for quite a while. Competition shooters using M1 Garand rifles, a semiauto first used in the US military in 1936, found utility in adjustable gas plugs to regulate the cycling of the action by letting out a little extra gas. Perhaps the most prolific use...