Airframes
Benevolens Magister
Oreo, it's a Sunderland MkV, which had a hatch on each side, immediately behind the trailing edge of the wing, which could be opened on a sliding rail. This can be seen on the exterior shot. The gun mounts themselves don't appear to be fitted, and would either be a pintle mount, similar to the B-17E/F, or a bracket mount on the hatch sill, which could be swung into position.
EDIT: Check the second from last (colour) pic in post #2. which shows the swing pintle mounts in place.
EDIT: Check the second from last (colour) pic in post #2. which shows the swing pintle mounts in place.
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