I liked the first two versions of the spas-12 in CoD (MW2, BO) so I'd go with that.
Also, in an unrelated note, anyone here going to watch the Sony conference today? I'm excited. --- Xbox Live: Eighth Element || PSN: Echo_Resonance || 3DS FC: 4012-3485-5071 ~TL;DR? Don't care.~ || ~ World's #1 Camper Hater ~