Abstract: A quick release child-resistant immobilization device for handguns, wherein an elastic strap is bent to form a sling and stretched around the gun hammer to hold the hammer in the inoperative position. The free ends of the strap are connected to a pin adapted to extend into the gun barrel and a handle is connected to the pin to facilitate manually pulling the pin out of the gun barrel by further stretching the strap to remove the strap from the hammer. The hammer and/or gun slide is held in the inoperative position by the tension of the stretched resilient strap until the pin is completely removed from the gun barrel, thus eliminating accidental discharge of the gun while a part of the device is still in the gun barrel. A sleeve is attachable to the pin to accommodate the mounting of the device on a gun having a bore substantially larger in diameter than that of the pin.