At a glance, I thought G1 toy Misfire's head sculpt was close enough to G1 toy Slugslinger's head sculpt to avoid a remould. The G1 toys both have visor eyes and nose/mouth face designs. That way in Titans Return, only a recolour would be required if Hasbro wanted a G1 toy look for TR Slugslinger (based on TR Misfire's head design). Obviously, it wouldn't be accurate to the G1 toy but close enough.