The S2 pistol .22 is definitely a project gun was weak the pellet 210 fps oiled the chamber sat overnight 285fps time for a rebuild.
I disassembled the gun and cleaned everything up and made a tight fitting leather piston seal and new breach seal re lubed it, now I crony it at 359 F.P.S. and the trigger it had zero lube out of the box, is much better. I now shoots fairly decent for a pistol that cost $50. A great pistol to learn on and tinker with.,