Correction: I’ve been informed that this is an actual Smith & Wesson revolver. Depicted is a semi-automatic pistol. If you want more/better information, go see IMFDB’s Hellsing page.
A roundup of the guns found in the original Hellsing anime. Anyone want to do a survey of the manga and/or OVA?
Used by Integra: Glock 23F
Walther PPK (taken from her uncle)
Smith and Wesson .38 semi-automatic
Used by Alucard:
Possible basis for the Casull: the AMT Automag IV. Differences: the Casull has no manual safety, is double-action, and has a longer barrel.
The Jackal, however, doesn’t seem to be based on anything. Totally fictional. (Not surprising, as it’s totally unrealistic. Just the way Alucard likes it.)