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Creeky73
23 April 2009, 14:17
Can anyone tell me if the RRA 9mm uppers will fit right in on one of their own regular AR-15 lowers? Or do you have to have a special lower for it to work? What other considerations, besides obviously magazines, do I need to keep in mind?

rob_s
23 April 2009, 15:06
you need a magazine block as well. I like the Hahn top load (meaning the block loads in from the top, not the magazines).