Thanks Micdrow,
I can really use the Me 410 armament manual. My guess a "Gurtkasten" is an ammunition box? Does the WB 151A has either 1 Gurtkasten with 2 times 200 rounds or 2 Gurtkasten with 2 times 230 rounds for the two MG 151/20?
Furthermore if the Me 410 A-1/U4 with BK5 cannon also has the MG 17's, does that mean the Me 410 B-1/U4 with BK5 also has the MG 131's?