I know this is an old thread, but I felt compelled to answer the question. The gun used in Reservoir Dogs by everyone except Nice Guy Eddie and Joe (and the cops) is a Smith & Wesson Model 5906 - 9mm. The caliber might be .40 S&W, but that is impossible to tell. Bottom line - I own the gun. Mine is pre-ban as well - so, double-stacked 15-round magazines.
Great gun - stainless steel, ambidextrous safety/decocker, and very balanced in weight.
Ironically, this is standard issue with CA Highway Patrol and hundreds of police/sheriff depts.
