All of Triton Arms TAR-15 Rifles feature as standard issue Triton Arms TAR-15 lower and upper receiver precision machined from T7075 T6 Aluminum forgings, Triton Arms TriDox Barrels 4150 CMV Steel in a Button Rifled Barrel or Cold Hammer Forged, M4 or M4A1 Profile with 1/7 twist. Our Bolt Carrier Groups are also TriDox treated for better performance in a multitude of harsh environments, from saltwater intrusion in a Marine or Harbor setting to the sand and dirt from the hot desert climates; even in extreme weather conditions bound with ice and sub-zero temps, our bolts will perform flawlessly each and every time. All Triton Arms Rifles are made in the USA with 100% USA Products and provide their owners a "Life Time" transferable warranty.