mag management is tougher because of the nubs on the sides. will always snag you pouch.
mags are harder to find unless you only run with highcaps. ugh!
not many people run 552's to share mags on the field when out of ammo.
shorter barrel length and collapsible stock for high maneuverability in a CQB environment.
mag management is easy.
mags are cheap and easy to find everywhere.
easy to borrow mags on field when out of ammo
long barrel length with full stock makes quick cqb movements near impossible.