Seekins Precision's .750 Adjustable Gas Block allows you to fine tune your rifle's gas system. The gas block is designed to be field adjustable. A brass friction screw is used to lock the adjustment screw in place. This allows the gas adjustment screw to be tightened or loosened without marring the threads, while still keeping everything secure in its place. Turn adjustment screw in to lessen the amount of gas and out to add more gas.