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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 Ball United States F A 7 1 profile view.5.56 x 45mm Ball United States F A 7 1 head view.

Details

TypeBall
ProjectileFMJ, GM, 1 knurled crimping cannelure
Casealuminum, taper crimp, yellowish gold anodized
Primerpercussion, flat, brass, ring crimp, black annulus
HeadstampF A 7 1
NotesThis is an induced case failure test round. It has an approximately 20mm longitudinal scribe mark on the side of the case, which was intended to cause a case failure so that case damage and burn-through could be studied.