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The S12 is the second shotgun you unlock in Call of Duty Black ops 2. It is a semi automatic shotgun that is incredibly fun to use. It has fairly little range and low damage, but when you shoot enemies they flinch and it is very hard for them to shoot back. This guide explains the best strategy and class setup to use with the S12,
Since the S12 is a shotgun you are going to have to be in the middle of the fight to be any good. The range on the S12 is limited, and at sufficient distance you aren't going to be doing any damage at all. Think about the route you are going to take and use the one that has the most close quarters and the least chance of somebody behind cover with an assault rifle.
When you are in range the S12 is very powerful. It is going to be very hard for enemies you are shooting to shoot back as you cause them to flinch a lot when you shoot them. That said, when there is more than one enemy it is going to be very difficult to win as the other guy that isn't being affected by being shot by you is going to have an easy time killing you. So when you do face more than one person move around and use cover so that you only engage with one person at the time, that will make you very effective.
Best Class Setup for the S12 Shotgun in Call of Duty Black Ops 2
Notice that I am using two wild cards. Wild carts let you go outside of the rules of class setup by allowing you an extra perk or an extra attachment and various other stuff. Because you are going to be in the middle of the action you will have very little use of lethal and tactical grenades as well as your secondary. The extra perk and weapon attachment is much more useful.
Flack Jacket and Tactical Mask allow you to ignore any small explosives and tactical grenades and let you keep going with killing enemies. Toughness is good because you are going to be shot at whilst you are shooting other people. Even though you aren't aiming down your sights flinch will still affect you so using Toughness is very powerful.
Long Barrel will give you some extra range and damage which is basically everything that the S12 shotgun is lacking. Normally the S12 reloads very slowly, so Fast Mags reduces the down time between magazines. You should never be aiming down the sights of the S12 shotgun, so the Laser Sight helps you with every kill by improving accuracy when firing from the hip.