Our UltraMatch Series is built with Extreme Accuracy as its primary focus. The backbone of every Rainier UltraMatch Upper starts off with a barrel made from a world renowned SHILEN blank 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.