OK I received the first of 3 complete uppers from RRA last night. I slapped it on a RRA lower I built usind all RRA parts and NM 2stage trigger. Everything seems to work fine but I have one question:
When I pull back on the charging handle, I have to manually press the bolt catch in to get it to catch the bolt. I don't remember if this was normal or not. I was not home last night when I assembled it so I could not access my other RRA's to compare it to.