20 x 110mm HS United States
Details
| Type | TP, M99E2 |
|---|---|
| Projectile | steel, aluminum windscreen, black, 1 copper driving band Projectile Markings: (white ink) 20 MM TP M99E2 LC-100-72 Driving Band Markings: (6 dots) KMO-2-6-60 20MM M99E2 |
| Case | brass, choke crimp Markings: (black ink) LOT RIP--3-5 1960 CASE, CARTG 20MM M21A1 |
| Primer | electric, flat, brass, ring crimp, red annulus |
| Headstamp | [none] |