Im not really sure about how I feel about removing the AS50 and M107, they are extremely powerful guns and in the right hands can be devastating, but in the server I play in which has normal loot tables my group of 6 has only ever found a couple of them. The pure fear and adrenaline that you feel when you hear an AS50 shot fly past your head will be gone and people wont really have to worry as much raiding high value areas. I think putting a limit of 2 or 3 of each per map would be nice. The main problem I see with completely removing them is that helicopters will have almost nothing to fear anymore so they will just dominate the map. Also, removing the .50 cals wont change player behavior, it will just make it so more people will use DMRs and M24s.