PS90 is the civilian version of the P90. its shoots the same ammo and has the same internals but lacks the capability to fire on full-auto,it also has a longer barrel and a green colored stock. any ammunition made for piercing armor is illegal for civilian use and possession.
the FS2000 is the civilian version of the F200. it shoots the same ammo and has the same internals but lacks the capability to fire on full-auto, it also has a green colored stock.
only a few lucky guys have gotten their hands on those two neat looking firearms. unfortunately the ammo is like "de la marde de pape"...very hard to find.
PS90 (5.7x28mm)

FS2000 (5.56x45 nato)