Hello all, I did a search for this question and it didn't jump out at me. I didn't see instructions in the paperwork that came with the carbine either. Hence this post.. I removed the rear sight briefly then reinstalled it to co-witness with a Primary Arms red dot. Lines up perfectly. But...when I reinstalled the front sight the forward most Allen screw would not tighten down into the top rail. It just spins. The other two mounting screws do tighten down. I assume it's stripped. So, called Hi-point today and they are sending a replacement top rail. Can someone advise on how to remove and replace the top rail from the 995TS? Does the carbine need to be stripped down? I know there is a locking mechanism in front. Not sure how to release that. Thanks in advance. Just got the rifle yesterday and signed up for this forum today.