Great Lakes Firearms GL-10 7mm PRC AR-10 5+1 24" Stainless Steel Black Barrel: 24 superior quality stainless steel (416R) with 5R rifling - Muzzle Brake: 5/8 x 24 stainless steel (416R) - Rifling: 1:8 Twist - 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 - Grip: Standard - BCG (Bolt Carrier Group): Custom design - Charging Handle: Custom design - AR-10 Compatible parts: Lower parts kits trigger safety - Magazine: GLFA custom aluminum 5 round black - Magazine has open witness window and tabs to pull down for easy loading