The Seekins Precision Adjustable Gas Block lets you to fine tune your rifle's gas system for smoother cycling and operation. Regulating the amount of gas used to cycle the action allows tuning the rifle's operation to a specific load and the use of low mass bolt carriers, buffers and springs to reduce felt recoil. The overall height of the gas block is 1.37" with left to right dimensions at .94" to fit under most hand guards and still have the customization of an adjustable gas block. It is melonite coated to reduce wear and corrosion for extended periods of fire. NOTE: This model does not include a gas tube roll pin.