As reported by Jesus Roman in a tweet posted on October 24, the Institute Defense Technology of the Royal Thai Army supplied the artillery with an upgraded version of the 20-tube 122mm DTI-2 MLRS based on the Chinese-made Type 85 /YW306 from Norinco. In 2012, Thailand ordered 4 MLRS from China and received them in 2013. Firing tests were carried on by the Defense Technology Institute (DTI) since 2020.
The Type 85 series was developed by NORINCO in 1985, exclusively for the export market. For the Chinese army, a very similar Type 89 AFV was designed. The main user of the Type 85 series are the Royal Thai Armed Forces who received their first vehicles in 1987. In 1987, Thailand took delivery of the first of some 450 Type 85/YW 531 APCs. These had their Chinese 12.7 mm machine guns removed and replaced by a standard US .50 (12.7 mm) machine gun that was (and remains) standard on Thai tanks and APCs.