Originally posted by Preludacris09
It really depends on the gun and the person using it like you mentioned. I've mastered all the guns and I found the LMG's to be the easiest to get mastery on, with Sniper's being the hardest, and assault rifles and smg's in the middle. The gametype and stage matters more than you would think also, i noticed that the majority of my FMJ kills were from HC in scrapyard.
thanks for this post.. im going to play some HC to finish my FMJ's

they take forever to finish in Core..