(adsbygoogle = window.adsbygoogle || []).push({}); Can someone please help me on how to level up your gun from 30-31 fast? It takes forever. I am trying to get the MSR Gold and i am half-way through 30. I have done all the gun challenges except kills and headshots.

Do all attachments (even though some of them suck) and do Double XP for weapon only, if you have a token available.