The P-38 had 4 .50 caliber Browning mgs and 1 20mm cannon all in the nose of the center nacelle.
Having 4 mgs might seem as a disadvantage as most US WW-II fighters had 6 .50 calibers. However by having the guns clustered around the 20mm canon the firepower of the .50s was concentrated and the pilots did not have to worry about having to be at the optimum range where the wing guns met at.
Regards
alfa6 ;>}
Late versions of the F4F, the FM-1/FM-2, had only 4 mgs, but carried more ammo.
And the plane was used on escort carriers doing ASW.