(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.

The Model 1887 was a pain in the bum to get gold because of the lack of attachment challenges, but the easiest gun to get gold IMO is the ACR or the MP7 because they are so easy to use...

Model 1887 was a pain in the ass.
The easiest was ACR and the MP7.

KSG-12 was THE hardest gun to use pre-patch. I used the spas and the model and they were better than the KSG now with extended mags all shotguns were beast.

i get mp7, ACR and LSW gold every prestige those three r pretty easy and i never change attatchments on them, they all have silencer

Hardest: Dragonuv and AA-12

Hardest: AA-12

Easiest: Barrett 50 CAL

Easiest- P90. MP7, ACR
Hardest- Model, KSG, FAD

p90 awesome