I've got an old 3-12x50 BSA scope that came with a used rifle I bought, and I swear, that scope tube isn't straight. Optics look okay, and it seems to change magnification all right, but I took it off the rifle and it's now a big paperweight.

stickin8s, if you want a cheap way to get introduced to BSA scopes, I'll send you the one I've got for the price of postage.