Weight- 4.3 oz. Mil-Spec tube diameter Impact Extruded 7075 Aluminum Extended Carrier Support Lip For Smoother Cycling Smooth Pistol Buffer Tube Lightening Cuts Reducing Weight By Approx. 1 Oz. Off Mil-Spec Unique Fluted Tube Design For Debris Clearing MIL-A-8625 F, Type III, Class 2 Anodized Includes PWS Ratchet Lock Castle Nut & End Plate Set