GREAT LAKES FIREARMS GL-10 .270 Win 5 round Semi-Auto Rifle | Pursuit Green Camo Barrel: 24" superior quality stainless steel (416R) with 5R rifling, Muzzle Brake: 5/8 x 24 stainless steel (416R)Lower: Aluminum billet (7075)Upper: Aluminum billet Handguard: 20" Aluminum, M-Lok, upper picatinny rail, Gas Block: .750, 4150 Steel, Black Oxide Coated, Gas System: Rifle, Stock: Hogue fixed rifle stock, black, Magazine: GLFA custom aluminum, 5 round, black, Grip: Standard, BCG: Custom design, Charging Handle: Custom designAR-10 Compatible parts: Lower parts kits, trigger, safety.