The wings on the BF109 were to thin to house more than one gun, it's also the reason the landing gear opened towards the fuselage,hinged at the wing root, no room. As the power output of AC increased so did the weight and fire power. After sorting out the bugs later model 109's had the cannons firing through the nose thus loosing inboard wing guns.
In the Pacific Theater there was little need for the Americans to use larger slower firing rounds as Japanese planes had little to no armor and no self sealing fuel tanks. Fast firing rifle and incendiary rounds in sort bursts was enough to light up Jap AC's.
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