Abstract: A safety plug for preventing revolvers from being surreptitiously loaded while on display in stores. The plug utilizes two O-rings that serves to firmly hold the safety plug in place. The use of O-rings eliminate the need for high precision plug dimensions, permitting inexpensive mass production manufacturing techniques. The O-rings fits within grooves that are substantially wider than the thickness of the O-ring which prevents O-ring shearing. Once inserted, the safety plug is within the bore and the adjacent firing chamber in the cylinder. Therefore, the revolver cannot be loaded, fired, or even cocked. The plug can only be removed by a cleaning rod inserted through the muzzle to screw into the connection threads within the plug to pull the plug out of the firing chamber.