Mastery and weapons
Gms, put the mastery off the old blackshot:
Headshot = 97
Normal kill= 75-80
its better than 30-40 per kill.
Put more weapons off gold and make gold weapons 3 stars kill from 1 headshot. (Ak47, Scars, etc...) Nots normally put 1 hs and they with 5 hp :).
Have a nice day :)