Type | TP, M99 |
---|---|
Projectile | steel, aluminum windscreen, black, 1 copper driving band Projectile Markings: (white ink) 20 G TP M99 KOP-99-336 Driving Band Markings: PMM-4-16 53 20MM M99 |
Case | brass, knurled choke crimp |
Primer | electric, flat, brass, ring crimp |
Headstamp | 20MM M21A1 NESCO 1954 (black ink) ELEC ELEC |