The plane was supposed to be a pretty powerful weapons: a gun of 23 mm caliber MP-6 (200 ammo - 300 rounds) to an easily removable carriage in the forward fuselage and two 12.7 mm machine gun BS (300 - 600 rounds) and four 7.62 mm machine gun ShKAS (1000 - 1500 rounds) in the center section. Originally it was planned to install 23-gun load cells, but prototyping Commission and the Air Force have recommended to replace it with IP-6. Instead of guns in the accelerated version airline could be hung bomb weighing up to 1,000 kg or one torpedo parachute. Planned installation of two jet guns PO-82 to protect the rear hemisphere. During the construction of the aircraft it was in the setting of the center section of two guns MP-6 with 120 ammunition rounds.