|Rate of fire||850rpm|
Designed by A.E.Nudel'man and A.A.Rikhter.
The NR-23, a design based on the VYa, became available in 1949, at first exclusively for use in fighters. Later it also replaced the B-20 as the major defense weapon for heavy bombers, being part of the NV-23 defensive complex. For several years the NR-23 was the major barrel weapon in Soviet bombers and fighters.
This gun used the same ammunition as the NS-23, but a better cartridge feed mechanism and other mechanical improvements increased the rate of fire by 55%. In China was built a copy under the designation 'Model 23-1'.
During tests in the USA a rate of fire of only 650rpm was achieved.