06-14-2011, 07:29 AM
I am going to be building a "precision" Grendel and want a billet upper. I'm leaning toward the Rainier Arms UltraMatch Billet Upper. Does anyone have experience with these? Can you tell me any pros/cons that I should be aware of? It's going to sport a 24" Satern barrel when done. I also see a lot of the people on here went with the Mega side charge upper. Is there any good reason I should choose it over the Rainier?
