typically speaking only high end optics for firearms will work on airguns because the recoil forces go in the opposite direction.
firearm recoils back-airgun forward
the forward motion will loosen the lenses of the optic because its reinforced in the opposite direction
high end scopes are usually made well enough to take the abuse but why put a $1000 scope on an airgun?
as for an airgun scope on a firearm, i dont know, it would be interesting to try
If you keep an eye on ebay you can actually get acogs relatively cheap. they are usually mil-surp or just happened to walk away in someones duffle
I've always been advised against buying optics on eBay....that said however, it's usually in reference to high end stuff because of counterfeiters. You'd prob be safe at that price range, tho. But again, I would personally wait for one of the guys who has experience with Sun products to comment because I have ZERO experience with them. They could be really good, I just don't know.
__________________ "Life's tough. It's tougher if you're stupid." -- John Wayne