Both aircraft were armed with two 7.62 mm (0.3 in) PV-1 machine guns, but the production model of the I-5 was expected to be armed with four, although this proved to impose too great a penalty to the I-5's performance.
Additional gun armament consisting of four wing-mounted PV-1 machine guns.
In 1942, some 3,009 PV-1 guns were converted to infantry weapons by mounting them on the Sokolov 1910 carriage (the one used in the PM M1910) at a factory in Zlatoust.
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