Finally managed to knock out my chicom and got my SMG's diamond. I know it's nothing impressive but it's the first time in any COD i've gotten all of the guns in a class with all their camo's unlocked. YAY ME!
I'm working on AR's and LMG's at the same time, i have the mtar, type 25, and scar gold, and the HAMR gold. All the head-shots are what my biggest issue is, i'm just not very head shot accurate, playing HC a really good game head shot wise for me is 6-7, and usually i'm more in the 2-5 mark.
I am a horrible sniper, so those will never be diamond, and the only shotgun I don't hate using is the KSG, which I have gold and I'm happy enough with that on shotties I think.