They are all just different selections you can get your PS90 in.Is there any rhyme or reason to the various sights being sold on the PS-90? I see all these listed above, and then visit the local gun shop and the only PS-90 they have has the rail and no optics at all. Then I visit the local military PX and buy one and it comes without a rail but a red dot sight. Are these all different year group guns? Different series? or??
Just like car trims and packages; they allow the ability for FNH to offer a much wider variety of choices for off-the-shelf PS90 variants.
I bought mine with just the rail with 3rd iron sight (peep sight in the rail) and no optics. This was find for me because I could pick and choose the optics I wanted instead of having been stuck with one of the stock optics I might not have wanted.