| Type | HEI-T, XM599 |
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| Projectile | steel, aluminum fuze, yellow with red Ts, 1 iron driving band Projectile Markings: (black ink) XM 599 20MM HEIT LOT DN 4 (stamped) 20 MM XM 600 LOT DN 5 LOT DN 19 (stamped on fuze) FUZE PDSD XM 594 LOT DN 12 |
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| Case | steel, choke crimp, dark grey lacquered |
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| Primer | percussion (fired), flat, brass, ring crimp, red annulus |
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| Headstamp | M187 LOT NO DN 46 (on primer assembly) M103 LOT NO DN 29 |
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| Notes | Projectile and fuze have been inerted. Bulge in case neck due to projectile being pulled and reseated to remove powder. Primer snapped. |
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