Description:

Our UM 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 renown SHILEN blank and the ultra precise Rainier Arms UltraMatch Billet Upper. 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:

• Rainier Arms 16" OR 18″ UltraMatch Barrel
• Midlength Gas System
• 1:8 Twist
• Ratchet Rifling
• Bead Blasted Finish
• Rainier Arms UltraMatch Billet A4 Upper Receiver
• Daniel Defense 12.0 LITE Free Floating Rail System
• Pinned Low Profile Gas Block
• Young National Match Bolt Carrier Group with Crane O Ring Installed
• PRI Gas Buster Billet Charging Handle
• Rainier XTC Compensator