I' m not exactly sure I understand what you' re talking about, but as long as the hook on the breech plug isnt broken off, it will work fine. All it does is keep the back end of the barrel from lifting out of the tang. Its not required that the fit be real tight. The barrel keys keep it in place. The hook is just there to secure it to the tang. (the barrel that is) You will enjoy that rifle, all the ones Ive fooled with were good shooters.