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5/22/2008 9:29:11 PM EDT
I think that I know the answer but I have to ask. If I have an
AR pistol lower that is .223 can I put a 9mm upper on it and
conversion for the 9mm mags on the lower. A friend ask me
and I said hell yes and then I started thinking about it and wasn't
sure.
Thanks
5/22/2008 9:53:25 PM EDT
[#1]
If you have a .223 pistol, can you use a 9mm barrel?

Yes, you can change barrels in pistols to use different caliber ammo.  Obviously, the mags might need changing as well (depending on the calibers).
5/23/2008 7:02:59 AM EDT
[#2]
His question is not can this be done, it's can this be done legally. The answer is yes.
5/23/2008 3:49:42 PM EDT
[#3]
Thanks for the info  
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