S&T Motiv created the K2A, which retains the full-length K2's features (including bayonet lug) while utilizing the upgrades of K2C including the upper receiver/handguard Picatinny rail, M4-style adjustable stock. Later, it was renamed K2C1 (C="Exterior design changed without performance improvements", by the South Korean Defense Specification) and adopted by ROK forces. K2C1 had several changes compared to K2A, including a new extended handguard rail with optional lower/side pictinny rail sections, flattop upper receiver with a detachable rear backup sight, and a new Magpul CTR-like adjustable stock. As of 2016, 200,000 K2C1s are in service with frontline troops. Partially due to the rail's screw attachment method, the K2C1 is slightly heavier than the original model. (3.684 kg (8.12 lb) vs. 3.37 kg (7.4 lb))
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