| Type | APDS, MK 244 MOD 0 |
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| Projectile | plastic, tungsten penetrator, red, 1 plastic driving band |
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| Case | brass, choke crimp Markings: (black ink) 20MM APDS MK 244 MOD 0 OLM10C124-005 ADL-7497064C NOT FOR FORWARD FIRING AIRCRAFT 20MM M103 ACN 10B006-0?? |
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| Primer | electric, flat, brass, ring crimp |
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| Headstamp | [none] |
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| Notes | This round, also referred to as an Enhanced Lethality Cartridge (ELC), was developed for the Mk 15 Block 1B improved Phalanx CIWS. It has a heavier, improved tungsten penetrator compared to the earlier MK 149 series. |
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