Triton Arms TAR-15 lower receivers are precision machined to stringent Military Specifications from 7075 T6 Aluminum Forgings, with a Mil-Spec Type III Hard Coat Anodize. They feature a Standard 3 position Bullet Pictogram Safety Selector; Safe-Semi (Full-Auto LE/Military Version Only). Triton Arms receivers have a Multi Caliber designation that is used for a variety of calibers that fit the AR-15 platform. Our attention to detail is of the finest class in the fit and finish that makes ours stand out from competitors. All forging marks are removed in the machining process, they are then tumbled and shot peened to provide a smoother, more durable and longer lasting finish.