Machined MIL-SPEC Aluminum Receiver Extension Tube accepts All M4-style MIL-SPEC Adjustable Carbine Buttstocks and Most Commercials.
(a) Six Precision-Machined Notches On the Underside Provide Plenty of Options for Setting Length-Of-Pull.
(b) Perfect for a Custom Build, Installing a MIL-SPEC or Commercial Stock on a Civilian Carbine, or (c) Updating a Fixed-Stock Rifle With an Adjustable M4 Stock.
(d) Machined From a Lightweight Aluminum Extrusion Then Hard Coat Anodized, and Dry Film Lube-Coated Inside for Smooth Movement of the Buffer and Buffer Spring.
(e) Requires Carbine Recoil Spring and Buffer, Lock Ring, And Receiver Plate, All Available Separately