I bought top glass because even my RF's got shot long to very long, but any IER/EER scope fixed or variable should work just fine. In deciding alot depends on what the target will be, stationary or moving, and at what ranges. Luckily there are handgun scopes availble now to fit every niche well except extreme long ranges, and dot, halo, etc as well to chose from. Wasn't much available in the late 50's/early 60's when I first started scoping handguns, and not of all that great quality - some pretty much worse than open sights same as many early RF rifle scopes were. Don't have any of those old handgun scopes anymore, do still have some of the early RF rifle scopes and wonder now how I got by with them. Much yonuger eyes I guess and not knowing any better.