Currently trying to master (get 500 kills with) every gun:

Guns Mastered: Total = 97
Still to master: Total = 6

ARs - 16/16 (DONE)
SMGs - 14/14 (DONE)
LMGs - 13/13 (DONE)
Snipers - 13/13 (DONE)
Carbines - 13/13 (DONE)
DMRs - 8/8 (DONE)
Shotguns - 9/9 (DONE)
Handguns- 11/17

As of 22/01/17