Colt AR-15 Mil-Spec Buffer Tube Assembly Carbine

Convenient kits contain all the components needed to securely mount the buttstock of your choice using original factory parts from the manufacturer of your receiver. Eliminates the hassle of tracking down every part and accidentally getting incorrect ones for your stock. Have everything you need to finish your build, so you won't be held up waiting for that one part you forgot to order. Each kit contains original factory parts; parts from one manufacturer will fit another manufacturer's receiver but may require minor fitting. Select the buttstock you want (available separately), then purchase the mounting kit for that type of stock. Mil-Spec Carbine kit is for adjustable- Mfg: Colt SPECS: Mil-Spec Carbine - Receiver extension: 7A 1/4" OAL (18.4cm), 1.14" O.D. Four locking positions for buttstock, unless otherwise indicated. Commercial Carbine - Receiver extension: 7A 3/4" (19.7cm) OAL, 1.17" O.D. Four locking positions.