It's the Vietnamese's covert answer to the PBR but, in this case, the kid at the front ducks inside the superstructure, the roof of which then concertina's back & the sides drop down to reveal the kid sitting in an armoured tub armed with four Chinese Type 54 12.7mm Heavy Machine Guns on a copy of a Czech M53 mount.
Chinese Type 54 12.7mm Heavy Machine Gun (doesn't have cooling fins on the barrel)

Czech M53 mount (armed with Czech vz. 38/46s (Czech copy of Soviet DShKM)

PBR Mk.II
