CMMG Carbine and Mid-Length Piston Conversion Kits Replace the front sight base, handguard cap, handguards, and bolt carrier assembly on a gas operated AR-15 style upper receiver assembly or rifle.

The Piston system operates cleaner by diverting the hot gasses and carbon at the gas block. The piston is hard chrome plated and is removable fom the front of the gas block. The one piece bolt carrier has an integral impingement key for maximum strength. The gas block has an "On" and "Off" setting. You can also remove the piston and set the gas system to "Off" for use with our .22 conversion kits. 

Available for either Carbine or Mid-Length Gas System.