 The M9 used the same chassis and mechanical components as the M5 . It was laid out to provide similar stowage , access to the radios from the inside , rear doors , and a pedestal machine gun mount as with the M2 . The M9A1 variant of the M9 matched the improvements made to the M2 , M3 , and M5 , changing to ring mount machine gun mount and three pintle machine gun mounts . 
