Good sight - Leapers UTG Sub-Compact Rear Sight for Shotguns, .22 Rifles

This is a good peep sight. I got it for an old .22 that was handed down from my father. Seems well built, but my only issue was that it doesn't quite fit the Weaver rail on the old .22 rifles I own. I don't know if this is due to the age of the rifles having a slightly narrower than normal Weaver rail, but a small set of shims should fix this issue.