Alexander Arms UST17 Upper Parts Kits 17 HMR 18 Black Cerakote Aluminum Receiver MLOK Handguard for AR15 Includes 2 Mags

17 HMR AR15 Upper Features: 18 Barrel 1:9 Twist Rate 1228RH Threading A2 Flash Hider Included Blowback Operating System Black Color Optional Cerakote Upgrades Below Two 10round magazines Parts Kit for Lower Conversion Included Weight of upper is 4.5 pounds