CMMG Receiver Extension and Stock Kit A1 AR15

The CMMG Receiver Extension and Stock Kit A1 AR15 is a purpose-built solution for shooters who demand the reliability and ergonomic profile of a fixed-stock platform. This kit is ideal for those looking to build out a lower receiver with a traditional A1 stock configuration. Whether you are assembling a duty rifle or a retro-inspired build, this kit offers the stability and consistent cheek weld necessary for precision and rapid target acquisition.

This assembly includes a CMMG A1 receiver extension, a rifle weight buffer assembly, and a rifle action spring specifically tuned for the A1 system. The rifle-length action spring and buffer work in tandem to provide a smoother recoil impulse compared to standard carbine systems, reducing mechanical wear during high-volume fire. The A1 rifle length buttstock assembly is manufactured to strict tolerances to ensure a secure, rattle-free fit on the extension tube, maintaining structural integrity under field conditions.

Professional armorers and tactical enthusiasts will benefit from the straightforward installation process on any standard AR15 pattern lower receiver. This kit is an excellent choice for operators who prefer a snag-free profile when working with plate carriers or heavy gear where adjustable stocks can sometimes interfere. When you choose this kit for your next build, you are investing in a proven recoil system that balances historical design with modern manufacturing.