Direct proof of use
Oryx's inventory of YPG equipment in northern Syria lists seven MT-LBs and identifies one as taken over from an unknown party in Iraq and armed with a 23 mm ZU-23 turret. The same inventory separately groups ZU-23 guns among anti-aircraft guns used for fire-support missions by the YPG/SDF inventory it documents.
A later Oryx loss list for the 2024 Syrian rebel offensive records two MT-LBs with ZU-23-2 guns as captured among Syrian government equipment, placing the same MT-LB/ZU-23 configuration in the late-war collapse of government positions in northern Syria.
Sources: Oryx Kurdish Armour In Northern Syria, Oryx 2024 Syrian Rebel Offensive Losses
Timeline
By October 2021, the YPG/SDF equipment inventory had cataloged an MT-LB carrying a 23 mm ZU-23 turret in northern Syria. The entry describes the vehicle as taken over from an unknown party in Iraq, so the source supports fielding by the YPG/SDF in Syria but does not establish original transfer custody or a specific combat incident.
During the rebel offensive that began on 27 November 2024, Oryx documented heavy Syrian government equipment losses in Idlib and Aleppo governorates and listed two MT-LBs with ZU-23-2 guns as captured before the Hama collapse cutoff used by that list.
Sources: Oryx Kurdish Armour In Northern Syria, Oryx 2024 Syrian Rebel Offensive Losses
Battlefield role
The documented Syrian examples fit the broader role of an improvised tracked anti-aircraft and fire-support vehicle: an MT-LB armored tractor carrying a ZU-23-family 23 mm gun mount. In northern Syria, Oryx places the ZU-23 among anti-aircraft guns used for fire-support missions, while the 2024 list records MT-LB/ZU-23-2 vehicles as captured materiel rather than describing a specific firing event.
The evidence therefore supports possession and fielding by the YPG/SDF, prior Syrian government possession before capture in 2024, and later opposition capture of at least two examples. It does not, by itself, prove which crews fired the two 2024 captured vehicles after seizure.
Sources: Oryx Kurdish Armour In Northern Syria, Oryx 2024 Syrian Rebel Offensive Losses