Direct proof of use
Armament Research Services documented a Serbian M02 Coyote 12.7 x 108 mm heavy machine gun in images posted to a Syrian rebel fighter's Facebook account on February 16, 2016. ARES identified the weapon as a Zastava Arms Coyote and distinguished it from the Soviet NSV by its stock, pistol grip, and tripod.
OCCRP and BIRN later traced a specific Coyote shown with a Free Syrian Army fighter from Zastava Arms in Serbia to Bulgarian Industrial Engineering and Management, then to Saudi Arabia, and ultimately into the fighter's hands in Syria. Their reporting also placed Coyotes with Syrian opposition units in Aleppo, Latakia, and Free Idlib Army imagery during 2016.
Sources: ARES Serbian M02 Coyote Syria, OCCRP Coyote Trail
Timeline
In 2015 and 2016, according to a Serbian Ministry of Defense statement reported by OCCRP and BIRN, Zastava sold a number of Coyotes to BIEM for export to Saudi Arabia. The same investigation says a Free Syrian Army fighter went through training in Saudi Arabia in early 2016 and saw the Coyote there before the weapon was delivered to his battalion through Turkey.
The first documented public sighting in these sources came in February 2016, when ARES identified a Coyote in images from a Syrian rebel fighter. Further 2016 sightings described by OCCRP and BIRN included a Latakia image in April, a Coyote instruction manual seized from rebels in Aleppo in July, and a Free Idlib Army video screenshot in November.
Sources: ARES Serbian M02 Coyote Syria, OCCRP Coyote Trail
Battlefield role
The documented Syrian role was opposition heavy-machine-gun fire support. The public record does not establish a complete inventory or every unit that received the weapon, but the cited images and investigation place the M02 Coyote with anti-government forces and Free Syrian Army-linked fighters in 2016.
The transfer evidence is separate from direct battlefield use. The Serbian government statement described exports to Saudi Arabia rather than Syria; OCCRP and BIRN reported that a serial-numbered gun and later battlefield imagery showed the weapons had reached Syrian fighters after onward movement through Turkey.
Sources: OCCRP Coyote Trail, Zastava M02 Coyote