STANAG magazine
The Zastava M90 is an assault rifle developed and produced by Zastava Arms in Serbia (formerly the Socialist Republic of Serbia, Yugoslavia). It was developed from the Zastava M70 assault rifle, a modified copy of the Soviet AKM, but with a Western-type flash eliminator added on the barrel end, chambered in the Western 5.56×45mm NATO caliber, and with a different magazine design, similar to a STANAG magazine.