Don't forget he also has an Uzi, he never uses it in the show but he loses it to Faye.Jet, of course, had the Walther P99.
He uses a Thompson Encore or Contender in "Sympathy for the Devil"Spike had a Jericho 941, though we also see him with a Beretta 92, and I think a Ruger P89 once too.
I personally believe it is Strayer Voigt, double stack, with a 6" barrel. Like this one.In the Cowboy Bebop movie, Vincent's pistol was definately a 1911 variant. But, given it's capacity, it definately wasn't normal.
I wonder what planetoid I was thinking of that has 4/5th Earth gravity?
maybe someday I'll understand Lain