The K1/K1A Carbine is the first modern small firearm developed by Republic of Korea. The K1 is a shoulder-fired, gas-operated, selective-fire carbine that feeds from a 20 or 30 round M16 magazine and has 1-in-12 rifling twist for 5.56 x 45 mm .223 Remington. The K1 uses the direct impingement gas system. The K1 is classified as a submachine gun in military of South Korea because the K1 was intended to replace M3 Grease Gun. The K1A is the upgraded version of the K1. All K1s in military of South Korea have been modified to K1A. The K1/K1A is manufactured by Daewoo.
While the K1 carbine is commonly regarded as a carbine version of Daewoo K2 assault rifle, it is better to consider K1 a separate carbine. Because,
* The development of K1 was completed earlier than that of K2. * The K1 uses the direct impingement gas system, while the K2 uses AK-47 style gas piston system. * The K1 has 1-in-12 rifling twist for .223 Remington, while the K2 has 1-in-7.3 rifling twist for 5.56 x 45 mm NATO (FN SS109).
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