I have a williams peep sight on the back of my SKS-M right now, and I'm tired of it moving around. I shimmed it to tighten it up and it still manages to move and screw up my accuracy. I used pieces of a soda can to shim it on the sides and bottom, but the shims deform and loosen up. It's crappy fix at best.
Is there a peep sight available that goes where the rear sight normally mounts that either fits well or is made of steel (so that I can add metal by welding the sight and machining it to fit perfectly)?
I was looking at the tech sights, but I don't like that you have to remove them to clean the gun. I'd prefer to not disturb my zero for cleaning or make field stripping require tools.