Ruger... I've got a buddy with one. He makes it a point to pick up dud .22 and ammo that's been laying in the dirt for months and even years and firing it through that ruger.. So far, 1 malfunction IN TOTAL, and Ryan runs a LOT of .22. There was one that sticks out in my mind, completely corroded casing and the bullet was no longer seated straight in the casing, but more of a +/- 30`. We shoved it into the chamber, forced it straight, and whacked the back of the slide a few times to get it into battery. Bang, with full extraction.

Oh, and I don't believe he's ever cleaned it