Weight- 4.3 oz. - Mil-Spec tube diameter - Impact Extruded 7075 Aluminum - Extended Carrier Support Lip For Smoother Cycling - 6 Positions for Stock - Lightening Cuts Reducing Weight By Approx. 1 Oz. Off Mil-Spec - Unique Fluted Tube Design For Debris Clearing - Engraved Position Numbers - Enlarged Drain Holes - MIL-A-8625 F Type III Class 2 Anodized - Includes PWS Ratchet Lock Castle Nut & End Plate Set - Lifetime Guarantee