Most info I seem to find is about the sporter model, where it actually says sporter on the gun. What, if any, is the difference between the sporter and one that simply says mak-90? Also, the sporters seem to have the date stamped on them as well, the numbers all appear to start with 92 or 94, but the non-sporter model does not seem to have this. Any info or good links about them would really be appreciated. I will say, the thumbhole is not too pretty, but the trigger is sweet.