Abstract: A firearm securing device which includes two members which are pivoted with respect to each other and which can be locked around a firearm. One of the members includes a protruding portion which when the two members have been locked will interfere with the normal action of the firearm in question, for example by protruding into the breech, the ejection chamber, or in the case of a shotgun by protruding to a position where the shotgun cannot be closed for use. The invention also includes provision for securing the device against removal from some anchoring point.