
From http://replicainscale.blogspot.com
From the best that I can tell, these same size cans feed the other four M2s that are in the front doors and rear windows on the left and right of the aircraft. There appear to be two that feed into each of the other four guns as well.
Are these possibly 20mm cans re-purposed to hold .50cal ammo?
Any help identifying these would be greatly appreciated.