 Like all Zastava produces AK variants, the M90 can be identified from the originals by its longer lower wooden handguard design, which has three cooling vents, no bulge and like the stock, is made out of different wood type.Also, due to using Western round, this particular model also has different magazine design, similar to Western STANAG and a Western type flash eliminator, similar to one used on American M16 assault rifle.Like on the other Zastava AK's, this three vent feature gives the M90 lower overheating when compared to the originals, but, the Western round in this case, slightly reduces reliability.