I'm starting my first SBR build and recently purchased an 11.5 BCM upper. I also purchased a VLTOR MUR stripped upper. I will be using a KAC URX II rail system for the build. The question I have is would the MUR upper be a better fit/better quality than the BCM? I am asking for because once I get the URX on its not going to come off anytime soon seeing as the tool to unscrew the nut is about $250.![]()


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