The NS-23 was a 23 mm aircraft cannon designed by A. E. Nudelman , A. Suranov , G. Zhirnykh , V. Nemenov , S. Lusin , and M. Bundin as a post-World War II replacement for the early VYa cannon. It entered service in 1945.

A synchronized version, designated NS-23S, was used for fixed installations firing through propeller blades.

Applications of the NS-23 included the Antonov An-2, Ilyushin Il-10, Ilyushin Il-22 , Lavochkin La-7, Lavochkin La-15, MiG-9, Yakovlev Yak-7, Yak-9U, Yak-15, Yak-17, and Yak-23. Some early MiG-15s carried the NS-23, although it was shortly replaced by the NR-23.

The NS-23 was replaced in service by the Nudelman-Rikhter NR-23 around 1949.

Specifications

• Type: single-barrel automatic cannon
• Caliber: 23 mm (0.90 in)
• Operation: gas
• Length: N/A
• Weight (complete): 37 kg (81.6 lb)
• Rate of fire: 550 rpm
• Muzzle velocity: 690 m/s (2,264 ft/s)
• Projectile weight: 200 gram (7.05 oz)