The Zastava M84 is a General purpose machine gun developed and manufactured by then- Yugoslav Zastava Arms company. It is gas-operated, air-cooled, belt-fed and fully automatic shoulder fired weapon.
The M84 is almost a direct copy of the Soviet PK machine gun, the sole difference being in stock, which is not hollowed like on the original and is made out of a different wood type.
The standard M84 is intended for infantry use, and is derived from the Russian-made PK machine gun. It differs from the PK-series in that it has a solid wooden stock and an unfluted barrel. It is also configured for tripod mounting (like the PKS) and comes with a scope mount (like the PKMSN).
The M86 variant is based on the PKT, and is designed to mount as a coaxial weapon on tanks and other combat vehicles. The stock, bipod, and iron sights are omitted from this version, and it includes a heavier barrel and electric trigger.