don't forget the Beretta CX4 Storm in 40 S&W; View attachment 27487
The Storm carbine has been well regarded for pistol, caliber carbine matches IIRC. It would be about the only non AR carbine I'd consider. Too bad Walther doesn't make a PPQ based 9mm carbine.
However, this one is a little funky, and I think it would make the best pistol caliber carbine:
http://www.shop.doublediamondsupply.com/AR-15_c3.htm;jsessionid=E2A947129975B1479DD84ADB5554609E.qscstrfrnt03
I know you don't have much to go on, but how is the fit and finish on the lower?
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