The mission's objective is to score 15 kills using MAG-7. While using the shotgun, you should keep in mind that it is excellent at short and medium distance, thanks to the weapon's spray, which does not do much damage over longer distances. While playing this mission, it is best to hide behind the corner and wait for the opponent. As soon as they appear in your sight, you can fire from a short distance, which usually ends in a kill. Also, remember to aim at the upper body. Below, 3 interesting spots where you can set an ambush have been presented.
The corridor shown in the above screenshot is often used by the opponents. If you wait behind the corner, you can easily score several kills. A good idea is also to throw a smoke grenade and stand in a position where you can easily see opponents coming out. This will make things easier for you.
While in the main room, you can keep an eye on 3 entrances. By strafing, you will be able to cover the majority of the map. Remember, however, that you have to hide for a moment, after you spot an enemy. This way, you will put MAG-7 to the best use.
While exiting the main room, mind the roof of the building, because opponents tend to jump off it to get inside faster - do not let yourself be surprised.