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I have on order an AR-15 LLR-15 M4 and I was wondering is it possible to put a different Caliber upper on my lower and if so how high of a caliber and still used the existing mags.
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yes you can and there are tons of options but only the 300 black out(300BLK) uses the same mags because the round is based on the 5.56mm, not sure if uppers are even out yet though.
also next time start a new thread instead of resurrecting one that's been dead for 2 years and not even staying with the same topic as the OP
and the search feature is your friend