Extender?

[dpeddicord]

I want to extend my shell magazine tube so I may attach different accessories (i.e.  flashlight, lazer, flame-thrower, etc.)  I've attached a link to a photo of my Mossberg 590A1 with 18.5" barrel and parkerized finish.  What would be the best way to do what I want to do?  I found this website, which is the only one that had a parkerized finish.  http://www.deltaforce.com/mossberg-590-5500-1-magazine-extension-parkerized.html

Any advice appreciated.

[grumpyirish]

If im not mistaken if you extend the tube you will have to get a new barrel or move the locking ring. Least thats how it was on my old mossberg ,the locking nut will not allow the tube to go through .Like i said that was awhile ago don't no if this have changed.
                                            DISREGARD   DID SOME HOME WORK  590 BARRELS ARE DIFFERENT

[870policemag]

I'd throw a +1 shot extension on there if it were mine.