They generally just soup up a military weapon for the movies. Get a bunch of still photos, determine the weapon, and what they did, and voilĂ , you have it. They used a ton of German and British WWII, and earlier, weapons in Star Wars.
The worst one that I ever saw, was a concoction some set armorer came up with in Blade Runner. They had Harrison Ford carrying a pistol made from the frame of a bolt action rifle. Right ugly piece of work.
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