UTG Pro AR-15 Mil-Spec 6 Position Buffer Tube Kit

The UTG Pro receiver extension kit has the parts to put a collapsible stock on an AR-15 lower in one box. It includes a mil-spec 6 position extension tube, a carbine buffer, buffer spring, receiver end plate and castle nut.

The tube is aluminum with rolled threads and a matte black hard coat anodized finish. The stock itself is not included; the tube takes mil-spec diameter stocks.