M1907 SF 'Gold Plated' muzzle not appearing.

Having same issue. Games been patched twice since then. The muzzle is there but, not unlocked. I've completed all assignments and mastery levels. I have nothing to work on to complete and unlock for this weapon. Should be a quick fix I hope they do. Kind of defeats the purpose of what I'm wanting to do for your guys game. Completing the class rank, weapon rank and all mastery levels for each class. Now I can't because short a muzzle because of a broke bugged game.