I put a red dot scope on my AR, took it to the range today to sight it in and all I did was shake it up real good. I need to loctite the screws that hold it on to keep them from loosening up. I have been told that there is a certain kind of loctite that works well for this purpose, because it will keep them from rattling loose but not permanently cease them up. Can anybody tell me what it's called and where you can get it?