On the eve of the Second Chalupistan War, Southern Chalupastan wanted to upgrade the firepower of their M 113 APCs so that they were more like an infantry fighting vehicle. They added 20 mm Rheinmetall MK 20 Rh 202 automatic cannon turret; the same as is found on the Marder 1 IVF. Time ran out long before many could be converted, but enough were to be distributed to at least one platoon per company of the 2nd Royal Guard Dragoons and the 2nd Armored Infantry battalion.
Additionally, some M 113s had a remote weapon station installed with a 7.62mm MG.
The M 113s and the Marder 20mm turrets were from C in C. C-in-C's M 113 model is nice as it has a gunner manning the 50 cal MG. I can always use them for something else. I am not sure what to do with the Marder bodies. They also come with a rear mounted, remote controlled MG. Unlike GHQ, which pretty much gives you five of everything, C in C varies the number of vehicles per pack. There was one more M 113 than there were Marders. I had a spare remote weapons station from a pack of Heroics & Ros Australian Bushmasters, so I stuck that on the remaining M 113.