Zastava M90, Semi-automatic Rifle, 556NATO, 18.25 Barrel, Chrome Lined, Matte Finish, Black, Magpul Zhukov Stock, 30 Rounds ZR90556FS The semi-automatic PAP M90 series sporting rifle was created on the operating principle of the M70 automatic rifle. Chambered in the popular 5.56/.223 caliber, the PAP M90 is an accurate, easy to control rifle platform for shooters of all types.