User blog comment:AdvancedRookie/Activision hints at more frequent DLC and content variety/@comment-190.149.117.152-20120106010813/@comment-3524248-20120106013240

I'm pretty sure any bullet would be effective on a person. And considering that there's no vehicles in CoD to use other bullets on, it's useless. It's a too complex feature as well. And honestly, the ACR isn't that great IRL. It jams frequently, I heard.