Two 23mm NR-23 autocannon alongside 37mm N-37 as armament of the MiG-15bis fighter aircraft.
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The NR-23 is an early Cold War era autocannon of Soviet origin. NR-23 was developed as more reliable and faster firing successor for the earlier NS-23, which it replaced on the production line. The NR-23 design as also scaled up, resulting in the NR-30.
The NR-23 is a further development of the NS-23. Reliability was improved and NR-23 has the ability for either left or right hand feed. The short recoil mechanism was rearranged in order to provide for a higher rate of fire. Barrel length and overall dimensions were kept similar to the NS-23, to allow for easier upgrade of existing MiG-15 and Yak-17 designs.
The NR-23 fires the 23x115mm round from a single belt. Cyclic rate of fire is over 800 rpm. Although, some reports indicate rate of fire in practice proved below 700 rpm. Commonly used ammunition types are armor piercing incendiary (API) and high explosive incendiary (HEI) with impact fuse.
For a number of years the NR-23 was the main type of cannon armament installed in both fighters and bomber aircraft. The NR-23 was used in later models of the MiG-15 and Yak-17, which used NS-23 earlier.
The NR-23 was developed as a faster firing and more reliable successor to the NS-23.
The AM-23 was introduced to replace the NR-23 for defensive armament on bombers and transport aircraft. The AM-23 has a shorter barrel and a much higher rate of fire.
The GSh-23 twin barrel autocannon is one of the successors of the NR-23. The GSh-23 has a very different operating principle, but uses a second generation range of the same type of ammunition.
The NR-30 was developed from the NR-23 to replace both 23mm and 37mm armament with a single higher velocity and higher rate of fire autocannon design.
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