CMC Triggers Adjustable Gas Block Features The CMC Triggers Adjustable Gas Block gives shooters direct control over how much gas is used to cycle the action which translates into reduced felt recoil and softer cycling on a standard AR-15. That adjustability becomes especially valuable when running the rifle suppressed where excess gas pressure can otherwise cause over gassing and erratic cycling. Its .750 inch inner diameter matches the most common barrel gas port dimension on the AR-15 platform making it a versatile fit across a wide range of builds. The low profile design keeps the gas block compact enough to sit under most free-float handguards without requiring extra clearance. A front adjustment screw controls the gas flow directly letting the shooter dial in exactly how much gas the system vents to the bolt carrier group. A side set screw then locks that adjustment in place preventing it from drifting loose during extended shooting sessions. The gas block is finished in a durable black manganese phosphate coating that resists corrosion and wear from heat and powder residue. All necessary hardware ships with the block including two set screws a roll pin and the adjustment screws making for a complete and straightforward installation on any standard AR-15 upper for sale at GrabAGun. CMC Triggers Adjustable Gas Block Specifications Manufacturer: CMC Triggers Model: Adjustable Gas Block Type: Gas Block Compatible Hosts: AR-15 Color: Black Material: Steel Finish: Phosphate Diameter: .750 Includes: 2 Set Screws Roll Pin Adjustment Screws Available At: GrabAGun