I have a flattop M-4 type Bushmaster with an Aimpoint. It all works well until I shoot 50 or so rounds and the mount gets loose from the rail. It has a thumbnut that, when it reaches a given tightness, flips over and it can't be tightnen further. So I need to either get a good mount that will stay put or figure out a way to adapt the one I have. Is there a good mount that is solid as a rock and still allow me to use the iron sights through it? I haven't seen this problem discussed here before. Sorry if this is a dupe. Any ideas?
sounds like the nut is stripped.
all offer good mount for the aimpoint and the taller or cantlever ones co-witness with you irons. i personally perfer the larue tactical cantilever mount.