The 590 has more steel and a thicker barrel as well as more capacity for shells. Only difference with the A1 is the A1 has an even thicker barrel just to make it more grunt proof, but unless you plan on grug clubbing rocks that really isn&rsquo;t necessary as far as practicality goes. Damn good guns and even come with a bayonet lug, only issue is swapping barrels can be quite a pain. Aside from that most 500 parts are also compatible, but if you&rsquo;re a college poorfag its probably better to stick with the 500. That&rsquo;s been Mossbergs golden gun for decades, and for good reason. <|endoftext|> 