Excellent product for your ar build - CMMG, Inc Receiver Extension Kit, Carbine Length

I needed a receiver extension for my current AR-15 build. I have had great success using CMMG receivers so I decided to try their receiver extension to mount my Magpul CTR adjustable stock. The mil-spec extension kit was a perfect fit to the receiver and the Magpul CTR stock. There were no issues with the build. I highly recommend the CMMG receiver Extension Kit. Be sure to order the correct part (milspec or commercial size).