The M1 Carbine is the standard by which all PDWs are measured.

[stanc]

I would have to disagree with that from the NRA. I am very fond of MP-5Ks for PDW work and have NO faith in .30 carbine even the M-2 just didn't have what was needed for work. I haven't used a M-1 or M-2 on two legged meat targets but on 4 legged it was VERY lacking. I belive the 9mm sets the standard the .30 carbine dosen't meet.

I agree that 9mm is a better "standard" for PDW calibers -- the .30 Carbine is more of an assault rifle cartridge, than a PDW round -- but 9mm FMJ terminal effectiveness is not likely as good as .30 Carbine FMJ.