I'm pretty sure that the number of guns on a B-17 depends on the model and configuration. Possibly even the particular mission. Counting the actual guns (2 per turret) I believe it ranges between 9-13 50 Caliber machine guns. Locations: Tail:2, waist 1Left, waist 1:Right, Lower Ball turret:2, Top Turret:2, Optional Rear Dorsal;1, Nose 1 to 3 depending.
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There were at least 9 variations of the B-17. Which one do you want to ask about? Most had one 7.62 MM and six 12.17 guns (B-17D). Later versions added more guns.