IIRC, it has nothing at all to do with actual performance, and everything to do with construction. M855A1 has a steel penetrator, whereas M855 and M856 don't.
I read a vague reference elsewhere that the ammo in question is 7.62X51. So it's possible someone pulled down some corrosive M2AP and reused the projectiles as mentioned earlier?
I read a vague reference elsewhere that the ammo in question is 7.62X51. So it's possible someone pulled down some corrosive M2AP and reused the projectiles as mentioned earlier?