Insuber, the cowling guns on the D XXI are very deep in the fuselage and fire through quite long blast tubes between the cylinders. It is very hard to see the muzzle flash.
The guns are indeed there.
This came up over at UBI and one of DT pointed it out.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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