20 x 102mm United States
Details
| Type | TP, M55A2 |
|---|---|
| Projectile | steel, aluminum windscreen, black, 1 copper driving band Projectile Markings: (white ink) 20MM BALL M55A2 LC-22-84 Driving Band Markings: (stamped) ZEL 2-90 57 20MM M55A2 |
| Case | brass, choke crimp Markings: (black ink) LOT LC-5-133 1958 CASE CTG 20MM M013 |
| Primer | electric, flat, brass, ring crimp, red annulus |
| Headstamp | [none] |