Watch out for MISR-90's. The MISR's were/are mixmaster rifles, Maddi receivers with Chinese/Norinco parts, assembled by Century Arms (I think). They are not well thought of as far as AK's go.......though I have one and after some tweaking it has made a fair blaster AK.
The Steyer/Maddi imports are much better rifles, though some had an odd but functional thumbhole type stock. The MISR-90's had the dysfunctional Norinco thumbhole stock. My MISR has a slant cut receiver as well.