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Yeah, except the Medusa has a unique rifling pattern to identify it for exactly that reason.
Cop: "Shit, this dude was shot with a 9mm, a .38, a .380, and a .357! Must've been four shooters!"
Lab tech: "Nope, just one silly gimmick gun that's sold only a few hundred units. Let's bring in everybody within a hundred miles who owns one."
As opposed to:
Cop: "Day-um, this dude's got a bunch of .45 slugs in him."
Lab tech: "Yup. Sucks to be him."