5.56 x 45mm United States
Details
| Type | Blank, XM200 |
|---|---|
| Projectile | [none] |
| Case | brass, 7-petal crimp, white lacquer sealant, 1 knurled cannelure |
| Primer | percussion, flat, brass, ring crimp, red annulus |
| Headstamp | R A 6 5 |
| Type | Blank, XM200 |
|---|---|
| Projectile | [none] |
| Case | brass, 7-petal crimp, white lacquer sealant, 1 knurled cannelure |
| Primer | percussion, flat, brass, ring crimp, red annulus |
| Headstamp | R A 6 5 |