Manufacturer of Precision Mil Spec CNC machined Lower Receivers and Flat-Top upper receivers. The Mag Well is Precision Machined with a Wire EDM which assures magwell dimensions and centering tolerances that are not possible with broaching methods. The opening has a generous chamfer and the internal surface appears polished which assures the magazine ejects flawlessly when the release button is pressed. All are are from 7075 T6 Forgings, Mil-Spec Type III Hardcoat anodized for the toughest most durable finish available, adding rigidity and resisting scratches/dings. Lowers are marked Cal-Multi (low shelf/pre-ban). Standard .154" hammer/trigger pins, .250" take down/pivot pins, and commercial dimension buffer tube. Custom personalized engraving available. Emblems and lettering are engraved, not stamped so critical dimensions are not disturbed. Order a Matched Flattop Upper/Lower combo and we will assure they fit without rattle, and min movement without sacrificing field accessibility or pin removal. This improves accuracy as well as the bolt carrier and buffer tube align perfectly. Uppers are machined for ejection port cover, forward assist, with case deflector and M4 feed ramps. The Matched Upper/Lower combo from USA Tactical Firearms is the perfect combination for building your custom AR-15 rifle. USA Tactical Firearms is Located 933 Meacham Rd Statesville NC 28677 www.USATF.US 704-872-5150