Thank you hamster for the quick response !
I haven’t past a long time analysis your blueprint.
I’ve check quickly the ‘update normal aiming’ event, but for now don’t have any idea to where to put my A/D input key in the existing event ^^ Need more time I think 
I think I’ll have a hard time trying to have a no weapon with standard animation, but I have the time to make mistake and learn, and to ask you some advices ^^