Ballistic Vests hack : How to use on Primary Weapons?

[WaR_H3Ad]

Hi everyone!

Today, on teknogods, i wanted to put the famous ballistic vest proficiency on my juggernaut's M604E (primary weapon, eh). I thought all would be ok, because i already used this hack in other classes.
But when i applied, there was no effect.

To be sure if it was a problem with my primary weapon, i tried the same hack on a secondary and when you use the weapon (that is to say when you have your weapon in-hand, you wear the vest, but if you swap to your primary the vest disappears) all was ok here.

I didn't tried to do this hack on a second primary weapon with overkill, i may test and i'll give you the feedback.
> EDIT: It doesn't work.

So, i would know how to use this ballistic vest hack on primary weapons please ....

Ps : While we're speaking about juggernaut's weapons, does anyone know why i can't have the juggernaut's M604E or juggernaut's Riot Shield in second primary weapon with overkill?


Thank you in advance all !

(And sorry for my bad english)