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A double-action revolver. These sprites are based on the revolver sprites from Powerslave (also known as Exhumed in some markets). I used an edited set by a guy named Mike12 (also known as the H-Doom guy) as a basis. Muzzle flashes are just the same as the 1911, from Shadow Warrior originally.
The pickup sprite is made by cutting and pasting some shapes from generic stock photos, turning it into a solid black stencil, then drawing in all the detail.