The Palmetto State Armory Custom Billet Battle series gives you a tried-and-true platform that will make it a go to rifle every time. Barrel: 16" Chrome-Moly Vanadium steel Chambered in 5.56 NATO with a 1/7 twist. Palmetto State Armory Custom 15" PSA Custom Teflon painted rail and a PSA Custom G COMP Break. Upper: PSA Custom Billet 7075-T6 AR upper is Teflon painted for durability and it's a paint job that will grab attention. These upper receivers are made for us right here in the USA. Bolt Carrier Group: Nitride 8620 steel bolt, with an enhanced firing pin and external 5.56 style extractor. The bolt carrier group is compatible with most aftermarket fire control groups. Lower: The NEW PSA Custom Billet lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for the caliber. PSA Custom 7075 Billet Aluminum Receiver Set Ambidextrous Bolt Catch Release PSA Custom Single Stage Flat Bow Trigger PSA Custom Ambidextrous Charging Handle PSA Custom Short/Long Throw Safety Selector PSA Custom 15" Handguard The Palmetto State Armory Custom Series line of accessories, components, and firearms are designed to give you the tactical or competitive advantage when you need it most!