Was wondering about this. The answer is: [spoiler]"No, no, no."[/spoiler] I'm sure there's a video or update that said so, but thought I might try for myself. For those of you who are new, the heavy ammo glitch was when you could basically guarantee a heavy brick every kill with Icebreaker. It was done by emptying all the ammo in your primary and heavy. Some other smaller rules applied, but that's the gist.