Are you referring to a target type of moveable pin sight such as you'd see on a 3D bow?? The type with a click type adjustment knob on the top of the sight bar?? These types are not suited very well to hunting, are not durable enough for hunting and can be noisy.

I have been shooting a moveable pin hunting sight for about 6 years. Some of the better ones are made by HHA (Optimizer Lite) and Cobra (Easy Slide). Both have a round scope type aperature but are not magnafied nor do they even have lenses. I would not recommend a scope with a lens for hunting. There will be debris on the lens constantly as well as clouding from rain or snow. I tried it for about one week during one season a while back and it didn't work out at all. Check out the sights mentioned. Just my 2 cents.

MN_BOWHUNTER