Exactly as the title says, it would be nice if Arachnos Soldiers could finally get the old unlockable Assault Rifle customizations. For some reason this was never on live despite the starting Arachnos Soldier powerset being graphically a subset of Assault Rifle. As it stands, we only have the old cash shop skins, which frankly look awful.
Specifically, the following should be ported:
Council Assault Weapon
Council SMG
Tommy Gun
Vanguard Redding Rifle
Nemesis Rifle
Nemesis Rifle 2
and if you're feeling generous, Military Assault Rifle, since the Arachnos Soldier powerset only uses bullets and grenades unlike the actual Assault Rifle powerset.
It always sucked that despite being able to have costumes that weren't the Soldier uniform, we could never change the weapon as well. I won't pretend to know how difficult it actually is to get the other models rigged up for customization, but given AR uses similar attachment nodes et al. I'm hoping it's easy enough that this will happen one day.