Our UltraMatch Series is built with Extreme Accuracy as its primary focus. The backbone of every Rainier UltraMatch Upper starts off wiith our Mod2 barrel and the ultra precise Rainier Arms UltraMatch Billet Upper MOD 2. Rainier UM uppers are built using the highest quality components available, test fired and ready to go. Look at the list of components and see for yourself. This upper is the best money can buy. Guaranteed to shoot SUB-MOA with match grade ammo and should group 1/2 MOA. All our custom uppers come complete with a limited lifetime warranty on all parts & workmanship. Component List: Ultramatch MOD2 .223 Barrel- 18" Rifle Gas System 1:7.5 Twist.800 Gas Ratchet Rifling Rainier Arms UltraMatch Billet A4 Upper Receiver MOD 2 Rainier Arms 15.5" M-Lok Switch 5.56 rail Pinned Low Profile Gas Block Match Full Auto BCG- Nitride Fortis  Hammer Charging Handle Rainier Arms XTC 2.0 Compensator