I personally think it should be like this. Guns are unlocked at a required level, they can be used as soon as they are unlocked. You also get COD Points, not to buy attachments, or camouflage, but to buy the challenges that unlock the desired camo, or attachment. But I hope they go smart, and make camo, and attachment challenges hard. Example: Say the best camo is see through, as in you can see through the gun, and see the gears, etc. But in order to get that desired camo, you'd have to get like a multi-kill of five. I want hard challenges not easy stuff like it used to be.