Light weight free floating barrel design. Steel barrel nut. Uninterrupted Mil-Spec 1913 Picatinny upper rail. KeyMod attachment at 3, 6, and 9 o clock positions. Ambidextrous sling swivel attachment points at 1 and 11 o clock. Patented bolt-up mounting system. Aircraft grade 6061-T6 aluminum. Mil-Spec type III hard coat anodized finish. Grade 8 military specification fasteners. Made in the USA.