Diamond shotguns are the easiest to get simply because there are only 4 of them.

Remington = easy
KSG = easy (except double kills)
m12 and the automatic shotgun are hard for 1 hit kills. Go to hardcore games and you'll get them faster than core.

but who the hell wants to play hardcore for gun challenges?

sounds like a great deal of fun. let me use a shotgun and run into noobs corner camping ads with the msmc.

Hardcore KC aint bad. All the others are camp fests tho

True. My COD style you could say is "rushing", whatever the opposite of camping is. HC pisses me off for that reason unless I am in a party and half of my party is sniping behind me.

I think it's safe to say my kdr remained relatively the same in hardcore as it did in core when doing the 1 hit kills with the m12 and the final shotgun. You can't run and gun like you can in core, you have to play a little more sneaky, but not really that much more.

my shot guns are gold and i loved them all but that one.... so stupid