The utg mil-spec receiver extension tube kit is made from 6061-t6 aluminum with rolled threads and a matte black hard coat anodized finish.Included is a 6 position extension tube, carbine buffer, buffer spring, receiver end plate, and a castle nut.Made in the usa.

Finish: Black Hardcoat Anodized
Type: Buffer Tube Package
Model: Receiver Extension Kit
Size: Mil-Spec
Material: Aluminum