Tacord 870 plus 1 Magazine extension tube with Cadex picatinny rail/ Duck Bill

I have a new tacord +1 magazine extension with spring and a Cadex 870 picatinny rail. With this combo the magazine  tube will sit flush with a dlask 14.5 inch barrel. Im Asking $200 shipped  i also have a very rare paradigm gator Remingto  870 duckbill asking $300 shipped. Or $400 for everything shipped