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A military small & medium caliber ammunition collection

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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, segmented taper crimp
Primerpercussion, flat, brass, ring crimp, red annulus
HeadstampW C C 8 8
NotesColt experimental Phase 3 duplex round for Advanced Combat Rifle (ACR) trials. From box labeled: 5.56MM DUPLEX PHASE III COLT TEST RDS HANDLOADED REAR BULLET FAB 10-88 FLUOROSCOPED FLUOROSCOPED (fluoroscoped stamped twice on box, once in red and once in blue).