20 x 110mm HS United States
Details
| Type | TP, M204 |
|---|---|
| Projectile | steel, aluminum windscreen, blue, 1 copper driving band Projectile Markings: (white ink) 20 MM TP M204 LC-1-39 (black ink) 20MM M99A1 GLN-1-11-68 |
| Case | brass, choke crimp Markings: (black ink) 20MM M21A1 RNO-1-55-64 |
| Primer | percussion, flat, brass, ring crimp, red annulus |
| Headstamp | [none] |