Tapco Carbine Rifle Chamber Safety Flag for PCC 

The Chamber Safety Tool™ for the rifle is specially designed to fit in the chamber of your pistol. As a chamber flag, this tool’s yellow color clearly shows that the firearm is unloaded. Comes with a strengthened head for increased durability. In addition to serving as a chamber flag, the flattened edge on the corner of the head allows you to adjust the windage and elevation of your scope.  This tool also works great in .22 caliber rifles.  Also available for shotguns and rifles.