Is this cylinder factory stock or has it been modified? The reason I am asking is due to the black rings on exit end of cylinder as shown in the pic? Serial # prefix BKZ. Thanks
https://picasaweb.google.com/zachcurtis/Model65?authuser=0&authkey=Gv1sRgCP6416iFzJXZYw&feat=directlink
https://picasaweb.google.com/zachcurtis/Model65?authuser=0&authkey=Gv1sRgCP6416iFzJXZYw&feat=directlink
Last edited: