All the current models come with either railed and no sight or railed with a Red Dot. That may change though.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??