Zastava M21
>
The Zastava M21 is a series of 5.56×45mm NATO rifles developed and manufactured by Zastava Arms in Serbia. Wikipedia
Action: Gas-operated (rotating bolt)
Barrel length: 460 mm (18 in) (M21 A); 375 mm (14.8 in) (M21 S); 325 mm (12.8 in) (M21 C)
Cartridge: 5.56×45mm NATO
Effective firing range: 450 m (490 yd) with iron sights; 600 m (660 yd) with optics
Feed system: 30-round detachable box magazine
Muzzle velocity: 925 m/s (M21 A); 890 m/s (M21 S M193); 870 m/s (M21 S M855)
No. built: 50,000+