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By this time, JG 26 were being re-equipped with the new Bf 109F, normally equipped with a 15 mm (or later a 20 mm) cannon firing through the propeller hub and two cowl-mounted 7.9 mm MG 17. Galland felt the model was grossly under-armed and so tested a series of 109 "specials" — one with a unique armament of an MG 151/20 cannon and two cowl-mounted 13 mm MG 131 machine guns, and another with integral wing-mounted 20 mm MG-FF cannons.