User blog comment:AdvancedRookie/Activision hints at more frequent DLC and content variety/@comment-190.149.117.152-20120106010813/@comment-190.149.117.152-20120106013006

If you could adapt your ACR in the middle of any combat, you could use the right caliber to the right enemies, or if you ran out of ammo and you were using 6.8 you could use ammo from other weapons