The British way was to clamp a Maglight in there since the Hensoldt was so expensive.
I would use the giant 8lb. Hensoldt illuminator crosshair device as a first choice... I mean you can find C batteries at Walgreens at 2AM and it uses a landscape light bulb to boot.... but if not then the 628 offset mount suggested first. They are around.
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Early SEAL teams also taped large flashlights to their MP5’s.