Hey

---If you wanna get the shotguns you must have a lot of time on your hands..

---Secondly i done it with one other person, this made it easier to get lots of kills.

---Thirdly you will want to play about 5 games and get to above 40 rounds, i got to 56, 72, 49, 42 and 40.

---!Try not to go down! !Get Lots of kills! Headshots do matter! you only need about 200 headshots for every 1000 kills.
Headshots help.

---Lastly make sure you play these in public matches. and if you say its too tough to get past 40, there are plenty of strategy's go get high rounds, and if you want the shotguns you'll do it.

---------------------------------- Hope this helped