They are excellent lil rifles, and GOBS of aftermarket barrels & other stuff is available for them. I would hesitate to pay 500$ for a used 1 however. It takes any 10/22 magazine, assuming it's in .22LR flavor. I like the Ruger ring mounting system a LOT, so I hope you received the rings that was supplied with the rifle when it was new.
Sometimes you earthlings REALLY amaze me!