I've just got the Hamr left to complete, I'm about half way through. It's been fun.
i tried to complete all the lmg not for the diamond camo because its hideous but that last lmg is terrible to use so i gave up
i have only just started on LMGs and pistols, SMGs, assault rifles,shotties, launchers i have managed to diamond up, but what a chore,
ARs would be the easiest transition
Snipers were not too bad in fact probably faster since there is only 4
Specials and Pistols if you want a more serious challenge
I have no idea how you people are able to get diamond...all those headshots! I have to manually aim for the head, and I always get killed before I get shoot...
I had the same frustration with headshots for LMGs. It took me a 1000 kills in team base matches to get 100 headshots on my MK48. However, for my HAMR, I found some youtubers doing headshots in free-for-all matches. You need to equip concussion grenades, reflex sight, quickdraw, Toughness perk, Dexterity perk, Lightweigh perk, and if you have it, the scavenger perk. In FFA, when you see someon, throw the concussion, aim for the shoulders, and BAM! Headshot.
The other thing that helped me was to keep your gun pointing to the middle of the screen, basically in the same vertical position as when you spawn in and try to only move it horizontally when you aim. This really helped. I was consistently getting between 3-6 headshots per match.
I find ACOG and Variable Zoom quite handy to get headshots with. You may need to run Stock on your LMG too, and possibly Lightweight. Aim chest height and the headshots should come.
Finding it extremely difficult getting headshots with the LMGs, think this is gonna be a long haul as i have only just started on this class,
I found them pretty hard to come by when I used the QBB but I just used the TF and aimed slightly higher up than I normally would. I think around 10% of kills resulting in a headshot is pretty common. Mine's slightly lower for the QBB but higher for the rest.