please explain how a 10.3 barrel is more limiting than those tiny little paintball markers? if you cant cqb with a bloody cqb, then your missing something, if cqb is too tight for one of those, use a pistol.
and before someone mentions it, its not like bloomin calibre matters....
and by the way, you dont need new pouches for a mp5 if you use a m4... (unless your a gearwhore) as mp5 mags fit two to a m4... and with ACM prices, a few mp5 hicaps cost next to nothing. so dot use price, a mp5k and a load of mags is probs cheaper than one of those little monstrosities.
R