I am looking for any input on the Mossberg Ghost Ring sites. I am purchasing a 590A1 shotgun Ghost ring site with the single post at the end of the barrel. I also saw a picatinny rail with a Ghost Ring site that had a "winged" front post and fiber optic in it. These were factory Mossbergs. Both MilSpec heavy walled barrels (metal trigger guard and safety etc). Now I'm guessing which would be a better benefit? Thanks in advance.