The Marlin model 60 is a quintessential .22 rimfire rifle. Marlin has been making them for a lot of years and they're easy to find new or used. I've bought a half-dozen over the years, but the kids keep packing them off. I think that I still have one, but I'd have to go look at the gun rack.
There is nothing fancy about a Model 60. Plain wood, plain ole gun, plain ole fun. Lots of kids have learned on Model 60's and they are one of the better values in the gun world today. Marlin has made over 11 million of them.
They're easy to take apart when you know how, and Junior has given us a page that shows the disassembly of the little rifle. Go here and he'll tell you all about it.