i just bought this rifle and dont really know anything about it. the left side of the reciever is marked:56S,semi-auto,7.62X39MM,made in china by norinco. SILE N.Y.N.Y. it also has a triangle with 66 in it just in front of the serial number. it also has a serial no. on the cover, the bolt carrier and the bolt. they all match. it looks like there used to be something else stamped just in front of the mag well,but it has been buffed off. i gave $400 for the rifle with 3 30 round mags(all have china stamped on the bottom)1 10 round mag, bayonet and cleaning kit. can anyone tell me what exactly is it and what it's worth??