Did something get changed?

Did some setting get changed with the server? I went to get on today and it told me I couldnt because my ak model differed from the servers. Ive been using this AK mod for months now, its one of my favs. Why did the server suddenly decide to hate on it?
Uh... No :( I just went and reverted to default cause I was in a rush to play on 47R. Now that you mention it though I think I'll go do that.