The M106A1 is a Mortar Carrier armed with an M30 Mortar 106.7mm (4.2-inch, or Four-deuce) mounted on a turntable in the rear troop compartment, the single hatch over the rear troop compartment was exchanged for a three-part circular hatch. The mortar could be fired from the vehicle, but could also be fired dismounted. The kit comes with driver and fire support crew, plus engine and rear troop compartment details. A standalone dismounted M30 Mortar with crew is also included.