Remington 552 Speedmaster.
I have worn out 2 Marlin model 60's. Seems like when they work they are awsome, but when they start acting up you can't (or at least I can't) get them to function properly. (Jamming). I have only owned one speedmaster and for me it has been flawless with 22 LR. not so great with shorts functions ok but not so accurite.