Im looking to pick up a 590a1 with factory ghost ring sights just cant decide between a 18.5 and add a vang comp + 1 extension (which I have on my current bead 18.5 sight) or go with the 20 inch barrel. I like the capacity of the 20 inch but often feel like the 18.5 points a little quicker when shouldering it. I currently have a 18.5 with bead sight but havent had much experience handling a 20 inch. I wonder if the 20 inch will be noticably heavier when loaded. I also have an s&j + 2 mag extension lying around that I stopped using because I didnt like that I had to trim the spring so much. I could put it on the 51517 18.5 with GRS but id have to come up with another spring option. This gun will be used for HD but could possibly (in a natural disaster, SHTF situation) be pressed into the role of a duty gun and be riding around in the trunk of my work car. What do you guys think 18.5 or 20?