A one-second burst from four ShKAS in Polikarpov I-153 or Polikarpov I-16 placed 120 bullets within 15 angular mils at 400 meters (1,312 feet) giving a firing density of 5 bullets per square meter of the sky.
3 × 7.62 mm (0.30 in) rear-firing ShKAS machine guns (later replaced by 12.7 mm (0.50 in) Berezin UB machine guns) in the canopy, dorsal and ventral hatches.
A 7.62 mm ShKAS machine gun was sometimes fitted instead of the UBS, while some were fitted with rear-view periscopes above the windscreen.
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.
It could be fitted with a single synchronized ShKAS machine gun aimed by a reflector sight, while the aircraft was also fitted with a radio.
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The military models were equipped with a 7.62 mm (.30 in) ShKAS machine gun, and later with a 12.7 mm (.50 in) UBK heavy machine gun.