Disable Depth Test - Opaques

I just tried the priority groups and it is not working, now the question is if we are using it the way we should what? It did work in UE3 (I used it for a lot of weapons and carried objects like a flag in CTF), so I do not know why it does not work in 4.6.1.

Isn’t that work around in quite some Call of Duty titles?