The SPAS-12 is unlocked at Level 24 for 2000 CoD points. It has 1 attachement, the supressor, which does nothing againist the gun (it helps by cloaking you from the mini-map when you shoot). This weapon does less damage than the Stakeout, but does have a larger mag size (8 rounds vs. 4 rounds). This weapon is best used at close to medium range.
User Stuff: I use this gun because of the high ammo (8 per round, best of all shotguns) and the supressor. No stories :[.