CVA Quick Release Breech Plug for Accura Optima Wolf is a replacement quick release breech plug. It is short for quick removable breech plug, this breech plug will only work on a Wolf, Ooptima and Accura V2 rifle after it has been fitted to the barrel. This can easily be done with the QRBP fitting tool, that comes with the QRBP as well as simple step by step instructions. Each QRBP that comes equipped on 2010 CVA Wolf, Optima,and Accura V2 rifles is fitted to that particular barrel that it came with. This is why it is so easy to install and remove.