I recognize the S&K scope base. Without mincing words: it's pure unadulterated crap. All I can say is if you're going to put a telescope on it, keep it as light as possible and put the permanent red 271 Locktite on all the screws, then tighten them until your nuts are in your nostrils. It'll still shoot lose eventually.
---------- Post added at 03:31 PM ---------- Previous post was at 03:30 PM ----------
Sorry for the spelling. Should be "loose".