Same thing happened to me a couple of years ago with a used (at a gun show) Handi in 22 Hornet. It had a Monte Carlo stock and open sights - I bought it anyway and put a scope on it... no prob after that because I didn't use the irons. My son has a .22 Sportster with a youth stock, and there doesn't seem to be a problem with it, irons or scope.
Cheers
Kerry