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Like the early Yak-1, it had a 20 mm ShVAK cannon firing through the nose spinner and twin 7.62 mm ShKAS machine guns on the fuselage(firing through the propeller), but was also fitted with a ShVAK cannon in each wing.
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The first 197 Yak-3 were armed with a single 20 mm ShVAK cannon and one 12.7 mm UBS machine gun, with subsequent aircraft receiving a second UBS for a rate of fire of 2.72 kg (6.0 lb) per second using high-explosive ammunition.