This plastic Squat model was made from a plastic dwarf warrior from the warhammer fantasy range. His weapon is a grenade launcher from the plastic Imperial Guard Cadian range. The left hand is from a left arm from the Cadian Heavy Weapon Team boxed set.
You can use other parts from the Imeprial Guard range such as backpacks and lasguns to make a whole squad of squats this way.
Dwarf Warriors Body Back B
Dwarf Warriors Body Front D
Imperial Guard Cadian Grenade Launcher
Cadian Heavy Weapons Team Left Arm A