hello it's been a long while since i posted on this forum but i figured if anyone knows the answer this is the place to find it. I have an older XD 4" barrel (i bought it in 2005 and it was a LEO trade in) in 357 Sig. it has the old style rail with just one slot towards the front. does anyone else have a similar model and if so what laser sights fit? thanks in advance for the apply!