20 x 102mm United States
Details
| Type | APDS, MK 149 MOD 4 |
|---|---|
| Projectile | plastic, tungsten penetrator, white, 1 plastic driving band Projectile Markings: (white ink) OLM05D001-019 |
| Case | brass, choke crimp Markings: (black ink) 20MM DS MARK 149 MOD 4 OLM05E001-017 NOT FOR FORWARD FIRING AIRCRAFT ADL-6264393E 20MM M103 ACN 05E012-008 |
| Primer | electric, flat, brass, ring crimp, red annulus |
| Headstamp | [none] |