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Rainier Arms UltraMatch Billet AR15 Upper A3 Model AR-15 Description: CNC Machined from solid Billet 7075 Aluminum and finished with Milspec Anodize. Designed to work with the Magpul BAD lever, Daniel Defense Lite rails and 99% of aftermarket accessories. If you want to build the best upper money can buy, look no further than the Rainier Arms UltraMatch Billet Upper. Extremely robust yet weighs in at a mere 9.3 oz. Made in the USA. - Limited Life Time Warranty against defects & workmanship
- 90 day - Satisfaction guarantee - 100% money back with no questions asked
The most critical features are: - Parallelism between the picatinny rail, main center bore and the centerline of the mounting lugs
- Perpendicularity between the centerline of the lugs and the barrel mating face (at the front of the threads)
- Flatness of the barrel mating face
We are holding .0003 or better on all of those measurements. Competitor uppers are between .001 and .003 on the perpendicularity and parallelism. Configuration:  |
