When I first got my 4095 the Point of Impact would change often. I realized it about the 4th time I took it out and had to sight it in yet again. I made sure everything appeared tight. Got it sighted back in. But the next time I shot it, the POI was off again (using same ammo). Those rear sights looked a little shady. When I would adjust them they would cant back and forth. So I ordered a very small and lightweight scope and put that on. I originally had no intention of putting a scope on the carbine because I did like the iron sights. The scope didn't help either. The POI still shifts. I tried to wiggle the top rail and it did appear solid. I mean it would flex if I put a lot of pressure on it. But that was much more force than the gun would ever be subjected to. I'm really easy on all of my firearms and treat them with care. I see some metal top rails for sale online. After reading through my experience above, what are the chances a metal top rail would fix my issue? I'm getting frustrated because I have spent more in ammo just sighting this thing in than what I actually paid for the gun. This could be a very fun little carbine that finds a special place in my heart if the darn thing will stay sighted in! (I am not new to firearms. I have an entire safe full and have been shooting for decades). Have any of you guys experienced this same thing? How did you fix it? Thanks! I sincerely appreciate everyone's opinions on this.