My takedown Gevarm semi auto carbine is a good field 22RF. Handles high velocity and sub-sonic ammo with aplomb. Fires on an open bolt and is surprisingly accurate despite this so called "handicap". There is no extractor or firing pin to break, just a raised ridge across the bolt face which crushes the cartridge rim diagonally across the head of the case as it drives a cartridge from the magazine and slams it into battery. This one has taken a lot of small game over a few decades of hunting.