
| Type | Dummy, M51A2 |
|---|---|
| Projectile | steel, 1 steel driving band Projectile Markings: (black ink) LC-88K273-033 (stamped) 20MM DUMMY M51A2 |
| Case | steel, choke crimp, cadmium plated Markings: (black ink) ????M103A1 ??? |
| Primer | percussion, flat, brass, ring crimp |
| Headstamp | [none] |