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Jesse - one could add a mag tube extension, but not much longer. Don;t want it sticking too far out past the end of the barrel. Note, the present tube is pretty much flush with the end of the barrel. A +2 extension might work OK, but wouldn't go much more than that.
Jesse, +2 tube extension would be optimal. Example : https://www.google.com/search?q=shotgun+magazine+tube+extensions&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj4rcef6P3gAhVJZawKHRARApkQ_AUIDygC&biw=1280&bih=596#imgrc=Mf8Rip1wgNM81M:
I would not and would go with a gun with a stock not a arm brace (putting a stock on this gun requires NFA paperwork and a tax stamp look at this 18.5 inch barrel gun https://www.budsgunshop.com/catalog/product_info.php/products_id/36700/remington+870+pump+12ga+185+6%2b1+6-position
