The CMMG ZEROED Adjustable Gas Block gives you the freedom to dial in the gas system exactly to your liking. Featuring a 20-position detent adjustment screw to fine tune your AR. The sacrificial cleanout chamber and user-serviceable design provides excess carbon a place to go where you can still clean it out. Includes a 6" 3/32 hex wrench to adjust gas settings, roll pin and set screws.
Internal bore: .750"
Internal bore: .750"
