The Chain SAW Light Machine Gun has the fastest fire rate but lowest accuracy, range and damage of the light machine guns. You can only fire it from the hip meaning that at long range it will be unlikely you can hit anything. Because the Chain SAW has low mobility and slow handling you need to stay a bit defensive with it. It is good at holding down a position and can take on multiple enemies at once.
The FP6 Shotgun is a pump action shotgun with high damage and good range but a low fire rate. Choosing how you move around the map is the most important part of using the FP6. Since it has a low fire rate make sure your first shot kills. Objectives are difficult to complete, but you can help by holding back enemies from the objectives.
The Bulldog shotgun is the only semi-automatic shotgun in Call of Duty Ghosts. It has the lowest range and accuracy but the fastest fire rate. The key to success is maneuvering the map well with shotguns, which is even more crucial with the Bulldog due to its limited range.
The MTAR-X submachine gun has good range and accuracy, average damage and a low fire rate. This means it is best at medium range, but the high mobility of the MTAR-X also allows you to be effective at close range. Always push up to the next firefight and use your mobility to your advantage.