The calculated data are not known.
To arm has different information,
V. Proklov's (director of the museum Sukhoi Design Bureau) in the "Planes of the world" № 2, 2001 wrote: "Armament consisted of three 23-mm cannons. A was placed (in the sleeve)in the bush of propeller, the other two - in the wing." Probably 'VYa'
According to Gordon /OKB Sukhoi A history of the design bureauand its aircraft/ the following information: "Gun armament of the fighter consisted of two wing - mounted 12.7 mm (.50 cal) UBS machine guns and single 20 mm cannon."