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5.56 x 45mm United States

5.56 x 45mm Duplex United States W C C 8 8 profile view.5.56 x 45mm Duplex United States W C C 8 8 head view.

Details

TypeDuplex
ProjectileFMJ, GM, steel core, 1 knurled crimping cannelure
Casebrass, taper crimp
Primerpercussion, flat, brass, ring crimp
HeadstampW C C 8 8
NotesColt/Olin experimental Phase 3 duplex round for Advanced Combat Rifle (ACR) trials. From box labeled: 20 CARTRIDGES 5.56 MM DUPLEX DAAA21-86-0367, PHASE III OLIN CORPORATION.