https://www.milsurps.com/images/impo...gs808oww-1.jpg
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Seeing how the right's electical wire tube is broken loose , I wonder if it's been wired to the other's trigger ? The right one is a much earlier design that might have originally had a box on the back . They might have wired them together for a double barrel blast . Or the box may be tucked under the mount so the gunner could fire left fist , then flick on the right and fire it second from the left's trigger.
Chris