Hey all, I am currently taking a Remington 870 Express, 12 gauge, and turning it into an HD/SHTF gun. My plan, that is already set in motion is to replace the 28" barrel with an 18" Remington replacement, a speedfeed pistol-grip and fixed synthetic stock, get the surefire pump-grip, and get the action tapped and have XS ghost ring sights installed. What I need to know is are there any other mods that I should embark upon? Dura-coat perhaps (Needs to blend in better here in the Arizona Desert)? and what defensive loads should I run through it? Thanks all.