Quote:
Originally Posted by pgrass101
Bud, I am thinking of building my on AR and had considered a 9mm after having shot the Bushmaster 9mm Carbon 15. Do you know of a lower that can take both 5.56 and 9mm or is that just a pipe dream?
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just about any lower can take a 9mm upper if you get a magwell block...I've heard that some of the colts with the sear block had a hard time running certain 9mm uppers but other than that you don't really need a dedicated lower...that's one of the many great things about the AR platform if you ask me