A military small & medium caliber ammunition collection

20 x 110mm HS United States

20 x 110mm HS TP M99 United States 20MM M21A1 NESCO 1954 (black ink) ELEC ELEC profile view.20 x 110mm HS TP M99 United States 20MM M21A1 NESCO 1954 (black ink) ELEC ELEC head view.

Details

TypeTP, M99
Projectilesteel, 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
Casebrass, knurled choke crimp
Primerelectric, flat, brass, ring crimp
Headstamp20MM M21A1 NESCO 1954 (black ink) ELEC ELEC