I looked through a few pages of the User Missions section of the forum and didn't see what I was looking for. I'm trying to find something sort of like the in game Armory (you can choose any weapon/vehicle) and then you can go to a target range and practice using it. The Armory is sort of okay for this, but the missions it assigns to you are lack-luster and you can't really use them to develop skill/marksmanship ability with a weapon. Essentially a training scenario. Even something like the shooting range the campaign uses to train you, but you can choose a weapon.
I apologize if this has been brought up before. I did some poking through and didn't see what I was looking for.