The K2 is capable of firing a rimless bottlenecked intermediate cartridge derived from what cartridge?
Daewoo Precision Industries K2 Daewoo Precision Industries K2 assault rifle was developed by the South Korean Agency for Defense Development and manufactured by S&T Motiv (formerly Daewoo Precision Industries). It is currently the standard service rifle of the Republic of Korea Armed Forces. Shoulder-fired and gas-operated, the K2 is capable of firing both 5.56×45mm NATO and .223 Remington ammunition. The K2 supplanted the M16A1 assault rifle for the Republic of Korea Armed Forces since its adoption in 1984.
.22 Winchester Centerfire .22 Winchester Centerfire (.22 WCF) is a small centerfire cartridge introduced in 1885 for use in the Winchester Model 1885 single-shot rifle. Factory manufacture of ammunition was discontinued in 1936. The .22 WCF was loaded with a 45 grain bullet with a muzzle velocity of about 1550 feet per second, similar to the performance of the .22 Winchester Rimfire (.22 WRF) designed in 1890.