I am considering buying a 9mm upper for my S&W M&P15 in 5.56.
Whose upper should I buy? I am currently looking @ Rock River.
Can I just pop the 5.56 upper off and pop the 9mm upper on or do I have to change a bunch of other things?
I do know I will have to get 9mm mags can someone tell me what kind to get and where to find them.
Any other advice on this subject please feel free to add.
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