I have a few old Marlin/Glenfield .22 rifles. One model 60 with a 22" barrel, an older Glenfield bolt action & a Glenfield model 75C. The 22" barreled rifles are scoped. I have always liked the idea of keeping iron sights on the model 75C as it has a shorter barrel. I just like the idea of keeping it kind of stream lined & handy. The rear sight on it has become loose. Not the base in the notch but the metal sight that attaches to the base. the rear sight seems to wonder. I was thinking of putting tech sights on it. I could take the rear sight off one of the other rifles & put on there but I would prefer to leave them alone. Have any of you used tech sights? What are your opinions?