The CVA™ QRBP Breech Plug Installation Tool is used to initially install new QRBP breech plugs, such as the Blackhorn™ 209 Breech Plug. To use the tool, simply tighten the breechplug firmly into the barrel. This fits/seats the threads of the breech plug to the barrel. Next, tighten the plug more tightley than you would be able to acheieve with just your hands, then loosen the plug. If the plug has not been tightened far enough, the rifle will not cock. After the tool has been used to install, you will not need to use it again. The tool ca also help to fix a rifle that will not cock.