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MK 149 APDS
The MK 149 are a series of US 20 mm (20×102) armour piercing discarding sabot (APDS) cannon rounds, which are fitted with the MK 68 series of APDS projectiles. Known versions of the MK 149 include the MOD 0, MOD 2, MOD 4 and MOD 5, which primarily differ in the MOD version of the MK 68 projectile fitted. The MK 149 rounds were developed for use with the MK 15 Phalanx Close-In Weapon System (CIWS), but were superseded by the later MK 244 MOD...
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