The primus chassis, also known as the UCVP, is made in the US
before being shipped here. It is a smaller version of the M109A6
Paladin chassis with components from the M2 Bradley IFV, reason
being it is meant for operation in forested areas. A total of 110
were built for the SAF from 2002 onwards. However, the turrets and
guns are made by ST in Singapore and fitted onto the chassis
locally. 54 turrets and guns have been delivered and no news is
available as to whether more will be ordered to outfit the
remaining 56 chassis.
Source: Jane's Defence Weekly and Asia Pacific Defence Reporter