The MAK-90 is a Kalishnikov. The Norinco made Type 56 is the same weapon, sans full auto FCG, the "evil " features (bayo lug, muzzle device, pistol grip). You will find that the stamped Mak-90 is one of the best quality AK pattern rifles ever made. These rifles have 1.5 mm thick receivers, vs. 1mm for most east bloc guns.
They break down the same as another Kalsihnikov. Do some research by googling and learn about what you have.
Here"s my MAK, I purchased in 1992 for $239:
