Thanks, great read on this weapon.
The Grease Gun has a legendary place in WW2 weaponry lore. As does the Krummlauf-fitted StG 44.
One of my bosses drove trucks in VN and carried one
It surprises me that AFAIK the Soviets didn’t have anything like the grease gun. Instead, they issued a more conventional submachine gun as it standard issue weapon. Even had chrome-plated bores in them . . .