Richard: I would be interested to know if your's is marked with Chinese characters or if it is marked in English. As for ammo - I would first get a set of new Springs from Wolfe Springs in Ardmore, PA., and then get a supply of ammo from Sellier and Bellot (best commercial stuff out there from the European Continent) or from Ron Reed, one of our moderators and sponsors who makes the best 7.62x25mm ammo on this side of the big pond. And, while you are at it get a couple of extra magazines - those Toks can sure burn up a lot of ammo in a short time.
Oh yeah, if you want to change the firing pin spring, the pin that hold the firing pin in place is a split roll pin, not s screw as it seems to be, and you need a specific type or style of punch to remove those pins without damaging them - it's a pretty easy job with the right tools. And, the hammer spring is under a lot of pressure but can be remove and the hammer/trigger group disassembled for cleaning, rust removal, lubricating and polishing. These things can be so much fun when they are not being shot at you ....
S.S. - Yep, I feel the same way ....................