At 950 , IMO is pretty steep for a used AR... Even at my Company, you can get a 9mm, flat top, flip up BUIS, a Tac Bag, and a 9mm mag for just about that same price... brand new.
For my personal 9mm AR, i have the Hanh 9mm block in the mag well. I guess you would call it a "dedicated" lower because it would take a little work to remove it... which would be a hassle. But to answer your question, No, it would not work by "only" changing uppers unless you have a magazine well adapter.
I LOVE my 9mm for many reasons. Well, main reason is that at 50 cents a round for the .223 nowadays, i simply dont want to pay that much just to practice at the range. Speaking of Range... I usually go to indoor ranges (which are all that are around me) and there is only 1 rifle range which allows .223 and that range is about... 40 minutes away.
Having a 9mm AR lets me practice with the AR platform at any gun range for alot less amount of money.
Here I am shooting Spike's Tactical's Personal FA 9mm AR:
http://youtube.com/watch?v=LpYdnZ1nrjE
Could you imagine how much that would cost per magazine to shoot .223????
Regardless, Good Luck with your 9mm hunt!!
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