I think the spas shotgun can be a sweet weapon for cs, it can have semi-auto fire and can be switched to pump to handle low power rounds like flares and smoke grenades.
-The advantage is when you have a pump shotgun u also have a semi-auto shotgun too
-some disadvantage is that it wastes ammo fast
-this is just like a regular shotgun so it shouldnt cost as much(1-2)
If you dont know what a spas shotgun looks like search it on google... too lazy to post a picture