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Lucky Gun is an episode from the Doraemon 1979 anime.
Nobita has some bad luck so Doraemon gives him a gun which shoots red bullets (actually bursts of light) for good luck and black bullets for bad luck, but no way of deciding which you get. Cowardly Nobita has 4 others try it first and they all get good luck. A little boy (Shizuka in other version) takes the gun and shoots Nobita with a black bullet and he gets all bad luck.