When you are thinking about building a new AR-15 rifle or completing that lower you have had sitting around” this CMMG AR-15 Carbine Receiver Extension Kit” 6-position Mil-Spec” is the perfect one. This kit contains an AR-15 rifle receiver extension” end plate” carbine buffer and spring. Designed to work with both standard 5.56mm NATO AR rifle builds.

1ea AR15 6 position buffer tube
1ea AR15 receiver end plate
1ea AR15 castle nut
1ea AR15 carbine buffer
1ea AR15 carbine buffer spring