I bought my icebreaker from xur in like week 4 when it first came, I bet you did too. I've gotten three in drops since then, but it amazes me that people don't already have it. Honestly, who cares? All this means is that noobs can actually help out when they don't know what to do, just tell them to icebreaker enemies. Icebreaker isn't a rare gun soooo why is everyone complaining?