ツァスタバM21 ザスタバM21 ザスタヴァM21 扎斯塔瓦M21 ZasM21
A series of Serbian 5.56×45mm NATO [b][[assault rifle]]s[/b]. Heavily based on the [[kalashnikov rifle|AK platform]], it was designed by Marinko Petrović and manufactured by "Zastava Arms":[https://www.zastava-arms.rs/en/home/] since 2004.

The current models use a 1.5mm thick stamped receiver. The M21 can incorporate picatinny rails for mounting accessories like [[optical sight]]s, [[foregrip]]s, [[bipod]]s, etc.

The Zastava M21 is gas operated, long stroke piston with a rotating bolt locking system [[rifle]]. It features a hard chromium-plated, cold forged standard rifled or an optional polygonal rifled barrel, integrated 22mm [[muzzle device]] [[grenade launcher]], heavy-duty dark/black synthetic furniture similarly to the [[AK-74M]] with a polymer side-folding stock, and side optics rail as standard (optional adapter base for cover mounted picatinny rail also available). The rifle can also mount a 40mm [[underbarrel grenade launcher]]. It is fed with standard 30-round [[magazine (weapon)|magazine]]. The cyclic rate of fire is 680 rounds per minute, sustained one is 120 RPM. 

h1. Variants
* [b]M21 A[/b] – Standard baseline assault rifle.
** M21 ABS – Built-in picatinny rail system.
* [b]M21 S[/b] – Compact short barrel assault rifle.
** M21 SBS – Built-in picatinny rail system.
* [b]M21 C[/b] – Carbine.
** M21 BS – Built-in picatinny rail system.
zastava m21