I originally had this in the SOLD thread but didn't want to derail the thread so I deleted it and will add it here.

I know the 45 Vs 9mm by heart, and still like the 45 as even if all you can find is ball ammo, it still will make a 45 cal hole. BUT with the newer 9mm ammo I don't think that it is really lacking that much at handgun range (to me 25 yards), with the CX4 I will stretch this to 50 as Federal told me to expect 1300-1400fps out of the 16inch barrel using their HST3 124 grain bullets.