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20 x 102mm United States

20 x 102mm APDS MK 149 MOD 4 United States profile view.20 x 102mm APDS MK 149 MOD 4 United States head view.

Details

TypeAPDS, MK 149 MOD 4
Projectileplastic, tungsten penetrator, white, 1 plastic driving band Projectile Markings: (white ink) KC-93C010R001
Casebrass, choke crimp Markings: (black ink) KC-93C001R001 (illegible) 20MM M103 ACN 91A007-063
Primerelectric, flat, brass, ring crimp, red annulus
Headstamp[none]
NotesThe illegible text printed on the case is probably a variant of "not for forward-firing aircraft". This is a reference cartridge.