Lead & Steel LSQGB-625 .625" 4140 Steel Nitride Gas Block

The Lead & Steel QGB (Quality Gas Block) is a precision gas block CNC-machined from a solid billet of 4140 carbon steel. Each block is individually gauged before being nitrided to hold a consistent .625" inner diameter that provides a thermal expansion coefficient similar to the barrel for reliable gas sealing. The black nitride finish is applied after gauging. Designed to fit any barrel with a .625" gas-block journal, the LSQGB-625 is a direct-fit replacement that carries the proven Lead & Steel QGB spec.