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This article is about guns that can be fired only in authorized locations .. For guns that can be fired only by authorized users , see Smart gun .. Smart gun. Smart gun. For self-aiming weapon systems , see Smartgun and Sentry gun .. Smartgun. Smartgun. Sentry gun. Sentry gun. A locationized gun is one that uses electronic technologies such as geofencing to restrict its firing to authorized locations , thereby allowing its use for protecting life and property in those locations while preventing its use in other locations for crimes such as robberies , drive-by shooting , assassinations , and massacres .