Remove the choke from AF barrel

Thats what ya do ... Generally choke will be found in the last 1" to 1 1/4"



OR .... Simply counter bore the muzzle to a depth that clears out the choke, clean up the crown and you still retain the same OAL along with the muzzle threading.



If it were mine I would REAM it out at 5/16" ( .312" ) which would make cleaning up the crown easy peezy .... DONE !