Brownells 75th Anniversary - A Shooting Heritage

All The Original Factory Parts Needed To Install Rifle & Carbine Buttstocks

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-length carbine buttstock that requires M4-type 1.14" O.D. buffer tube. Includes receiver extension tube, carbine recoil buffer, buffer spring, receiver plate, and lock nut. Commercial Carbine – For adjustable-length carbine buttstock that requires a “commercial” 1.17" O.D. buffer tube; same components breakdown as Mil-Spec kit.

COLT – From the original manufacturer of the M16 battle rifle. A1 Rifle, A2 Rifle, and Mil-Spec Carbine kits available. Carbine kit contains the four-position, Mil-Spec receiver extension used on the Colt M4 and Law Enforcement carbines.

HIGH STANDARD – Original parts used in the HSA-15 series of rifles and carbines. Commercial Carbine and fixed A2 Rifle kits available.

AR-15, Issue:11, Page:042
Big Book Catalog, Issue:73, Page:055

SPECS:  Mil-Spec Carbine – Receiver extension: 7¼" OAL (18.4cm), 1.14" O.D. Four locking positions for buttstock, unless otherwise indicated. Commercial Carbine – Receiver extension: 7¾" (19.7cm) OAL, 1.17" O.D. Four locking positions.


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Style: Carbine, Mil-Spec