[itstock]

I want to build a 9mm AR on a pistol lower. Does anything special have to be done, or is it as simple as swapping uppers and inserting the mag adapter? Do the 9mm need the same buffer tubes? What about the rest of the lower, all good?

Thanks for any help, or links if this has been talked about before. I already have 1 AR pistol and love it, but I haven't decided if I want to use that lower for my 9mm build.