(adsbygoogle = window.adsbygoogle || []).push({}); Me personally the hardest one was Model 1887 then pkp pecheneg.
The model took me half of my 5th prestige and the pkp pecheneg took me around 8 hours of 2x weapon exp.

The easiest gun for me was pp90m1. I got it gold the 2nd day of release only running rapid fire and extended mags. after that it was the l86 lsw. All I ran was grip until I got to level 30 then I did the rest of the attachments.

Hardest was the PKP LMG, it sucks so much.
Easiest was the MP7 it's so OP.

XD try out the model and you will see how much rage inducing it is in the beginning.

It's the Models.
The only has two challenges, four if you prestiged.

M60 was easiest for me. Hardest would be either model or dragonov

I would have to say the models definitely the hardest. Easiest ones for me were the m4a1 and the p90.

Model 1887 & AA12 after these guns every weapon is easy to get gold.

Model and pre patch KSG 12
Have to say the rest of the shotguns follow why use a shotgun when a SMGs has more range ?
AA12 was also hard due to being forced into a certain setup.

ACR or MP7 you can use any perk and do well with it.

Shotguns gold are one reason why i won't prestige the pain not worth it

Hardest was pre patch M16, what a bad experience. I had to play eay to defensive.

Easiest was ACR or PP90M1 but that and MK14 are my favorite guns along with P90.

For you more adventurous I'd imagine Shotguns would be by far the hardest.

AA12 was so much pain in the Ass >_>
I think a Knife have a better range than this shitty shotgun.
Easy was ACR,MP7,Striker