I have two pt 1911's, the first one breaks down and reassembles just fine, the new one when trying to assemble it, the slide stop doesn't go it all the way to fit flush, i feel where it wants to go in and it does go in a little bit but not all the way to sit flush, if I just put it in and let it hang down towards the trigger guard it goes all the way in but trying to rotate it around to where it meets the notch in the slide, it won't go in all the way like something is stopping it but trying to lube the area and trying a rubber mallet lightly, nothing is making it go back in! I tried seeing what would happen if i left it how it was but with an empty mag the slide won't lock back so obviously it needs to go in all the way but I don't know what else to try.