Brownells 75th Anniversary - A Shooting Heritage

Rugged, Six Position Tube For M4 Type Stocks

Mil-spec receiver extension tube has the correct 1.148" outside diameter to ensure proper fit of adjustable mil-spec carbine stock. Allows you to install a mil-spec stock on a commercial carbine, convert a rifle with a fixed A2 style stock to an adjustable M4 stock, or complete a custom build. Six machined notches on the underside prevent the stock locking pin from slipping, yet still  offer outstanding ease and flexibility in setting the buttstock length. Precision machined from strong, lightweight 7075 aluminum, then hardcoat anodized with a hard, wear-resistant matte black finish.

AR-15, Issue:11, Page:047
Big Book Catalog, Issue:72, Page:055

SPECS: 7075 T6 aluminum, hardcoat anodized, matte black. 7¼" (18.4cm) O.A.L, 1.148" (2.9cm) O.D. Fits mil-spec AR15/M16 lower receivers. Rifle conversion requires a carbine spring and buffer, available separately.


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Style: Carbine, Mil-Spec