Ermm. I think I have been misunderstood, my fault for not explaining properly, and not helped by the fact that the picture I uploaded will not show up for some reason.
Anyway, I have been using the L110 or something, but, I am stuck on the 100 round belt box because I am showing as 55 in red on the 200 round box, and at the top of the screen it is showing "Over Capacity" and then 150 / 100 The 150 is in red colour.
So if I am not mistaken, it looks as though I have been too good and got too many points to be able to use an unlocked larger ammo belt box.
Please tell me I am wrong ?
EDIT. Just did some digging around, and it turns out that my image to show what I am talking about won't show up because I have to create an account on an image hosting site somewhere and then upload my picture to be able to link it here to show you what I am talking about something potentially wrong in the game. Jesus Christ, WTF.