
| Type | Dummy, MK 100 |
|---|---|
| Projectile | steel, aluminum windscreen, gold, 1 copper driving band Projectile Markings: (black ink) 20MM DUMMY INERT FOR GUNS MK 11 & 12 Driving Band Markings: 20MM MK-11-1 [A] GLN-68-5 |
| Case | steel, choke crimp, cadmium plated, 6 holes Markings: (black ink) RNO 1-641 |
| Primer | none |
| Headstamp | 20MM MK5.MOD.0 RNO . 3-67 . |