5.56mm 62 grain M855 ammunition features a FMJ steel core penetrator spitzer boat-tail bullet, with a green bullet tip. The M855 projectile has much-improved penetration characteristics over the old M193 55-grain projectile at all ranges, resulting in higher retained velocity and greater accuracy at long range. The 5.56mm M855 is ideal for use in AR15, M16 and M4 rifles.