I would go with a 9mm upper on the AR platform. Make sure you replace your trigger and hammer pins with a set of KNS pins. Those that don't will find out why they should after they break their hammer pin.
I would also recommend a top loading mag block. They are easy to install and remove if you want to change uppers. Most have a dedicated 9mm rifle and don't switch back and forth. If you budget allows you might be able to do the same.
Hey all, I am looking into getting some sort of 9mm carbine. Anyone have a Ruger PC9, Beretta CX-4, Kel-Tec SUB2000, or one of the Colt or Oly AR style nines? Any feedback would be appriciated.
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