>>63971610
>Would this upper be okay?
>BKF
I've never heard of that brand so I can't really give my opinion on it, sorry.
>I have M&P 15 Sport 2
That's certainly not anything fancy but they get the job done unless you're mag dumping thousands of rounds a day into tin cans in your backyard.
Also why change the whole upper when you could just get a better barrel and BCG?

Anyway you should ask /ARG/ that question, you'll get a better answers from them.

>>63971564
TL;DR sounds like you'd enjoy shooting your AK if it wasn't cost prohibitive.
>Plastikov
Was the old wood furniture beat to hell that badly?