ATI ALPHA MAXX 5.56x45 16" Barrel 30 Round - Black At its core, the Alpha Maxx RIA features a 16-inch 5.56 NATO barrel with a 1:7 twist rate, making it capable of stabilizing a wide range of bullet weights for versatility in performance and accuracy. The 15-inch free-float M-LOK handguard provides ample rail space for optics, lights, grips, and other mission-specific accessories. Built with a flat-top upper receiver, it allows for complete customization of your sighting system. The Alpha Maxx RIA lower receiver is constructed from a durable yet lightweight hybrid polymer reinforced in stress areas, keeping the rifle nimble without sacrificing ruggedness. The rifle also includes a 6-position M4 adjustable stock, enabling shooters to tailor the length of pull for ergonomic comfort. The included 30-round magazine ensures you're ready for extended sessions or high-volume shooting. The Alpha Maxx comes with a standard trigger and a six-position collapsible stock, allowing shooters to tailor it to their needs. The Alpha Maxx also includes a Picatinny rail for mounting accessories.