CMMG Inc Receiver Extension Kit Pistol. CMMG pistol receiver extenstion canbine buffer assembly and carbine action spring all included Specifications for CMMG Inc Receiver Extension Kit Pistol Length: Manufacturer: CMMG Color: Black Finish: Black Fabric/Material: Nylon Reinforced Frame/Metal Gearbox/Outer Barrel/Polymer Pistol Gun Model: AR-15 Gas System Length: Pistol Length Caliber: .30 Carbine Package Contents: CMMG Inc Receiver Extension Kit Pistol Length The CMMG 55CA65A AR Pistol Receiver Ext Kit AR Style AR-15 Black is a quality addition to the CMMG lineup. For more great deals on AR15 Buffer Tubes by CMMG please browse our CMMG Inc Gun Parts page. What firearm models does the manufacturer say CMMG Inc Receiver Extension Kit Pistol Length is compatible with? The manufacturer says that CMMG Inc Receiver Extension Kit Pistol Length is compatible with AR-15CMMG 55CA65A AR Pistol Receiver Ext Kit AR Style AR-15 Black