Maeshone said:
Pump Action Shotgun from DOOM/DOOM2 (coincidentally also the best shotgun EVAR!!!)
Bessy
'nuff said
Double barrelled shotgun from Doom2 was better. More or less the same rate of fire, and though it used up 2 shells in one go, it did rather more than twice the damage of the pump action one, for some reason.
Vampire The Masquerade: Bloodlines had a SPAS-15, which is the first really decent gun you get (IMHO), and you get it before being stuck in that annoying sewer level.
Also, when offered, a Malkavain can respond "Let me see this crazy spaz"...I shouldn't have found that funny, but I did.
On the other hand, though, SPAS stands for "Sporting Purpose Automatic Shotgun", in the hopes that the US would accept it as a hunting weapon, presumably, which is rather dishonest of them.