Kodiac, glad you mentioned heavy. I took a 3-day Randy Cain shotgun course and my 590 felt like it weighed a ton on the last day.
By the way the consensus was that the Mossbergs in the class wouldn't make it thur the whole 3 days. It turned out that they were the only ones that had no problems! I use my Mariner on the boat and have a 500 in cabin.
I'm trying to standardize the sights and accessories with my 590 and 500 house guns.