I am not so sure the ammo tray was an official modification, but rather was a locally produced item. Normally just an ammo box was secured on the arm by a small cargo strap. There was a modification later on with a couple U bolts and some canvas bags to catch the spent brass and links.
There was also talk in this thread of the GPMG mount being on regular force vehicles. That was never the intention, they were meant to be on militia armoured recce jeeps only. Of course, with VMOs, it was possible for one to find it's way to the regular force, but that wasn't the intention of the kit. It was to be used as a trainer for armoured recce procedures like spec fire or covered withdrawals.
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