The hull base had a robust boat-like appearance that has a pronounced recess amongst the upper tracks and exterior suspension arms with cast aluminum roadwheels and return rollers along with a one shock absorber on the primary roadwheel pair. Forged aluminum road wheels had been utilized to preserve excess weight. https://hoytmachineguns.com/product/sterling-mk4-9mm-smg-sub-machine-gun-for-sale/