
| Type | Flechette |
|---|---|
| Projectile | Sabot, fiberglass, steel flechette, white, 1 smooth crimping cannelure |
| Case | brass, taper crimp |
| Primer | percussion, flat, copper |
| Headstamp | R-P 222 REM MAG |
| Notes | Late 1980s AAI ballistic test round for testing at Picatinny Arsenal as part of the development of suitable cartridges for the Advanced Combat Rifle (ACR) program. |