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I noticed that too...the B-25H did have (4) .50 MGs in the nose, arranged in a slight arc, and this photo you've provided shows what looks to be the same arrangement - four 50'sIt may just be me, but looking at the cleaned up picture close it looks like there are more than 2 guns in the nose. The way they arranged in an arc they blend together, but the gun looks too thick compared to the on in the back.