| Type | Inert, MK103 MOD0 |
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| Projectile | steel, aluminum windscreen, blue, 1 copper driving band Projectile Markings: (white ink) 20MM DUMMY INERT FOR GUN MK 12 MK 103 MOD 0 (stamped on windscreen) 1211649-A-1 Driving Band Markings: 20-MM MK. 11-0A LOT 9AFP |
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| Case | steel, choke crimp, cadmium plated Markings: (black ink) RNO-1-157 INERT |
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| Primer | percussion, rounded, brass, ring crimp, green annulus |
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| Headstamp | . RNO . 12 . 63 . 20MM-MK5.MOD.0 |
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| Notes | Case is loaded with an inert powder substitute. Note the inert percussion primer - live rounds in this caliber have electric primers. |
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