Mossberg 590A1 Shotguns +1

590A1 Typhon

When reading through comments on a webpage or social media site, a response of +1 typically means the commenter agrees with something that was previously stated by saying he or she is one more person to state whatever point was made. O.F. Mossberg & Sons is applying a similar line of thinking to its 590A1 line of shotguns. Only for them, the +1 means one additional round of authoritative 12 gauge ammunition in the tube.

For 2016, Mossberg increased the standard capacity of its 590A1 shotguns from six rounds to seven while still keeping the magazine tube within the typical magazine length. I should note that Mossberg, like most companies, describe its shotgun capacities as including one shell in the chamber even though many people keep the pump action guns “cruiser ready” (full magazine, empty chamber.) This means the magazine-only capacity has been increased from five rounds to six.

590A1 Typhon

There are four models of 590A1 shotguns affected. They include the basic model with a bead sight, the basic model with ghost ring sights, the Kryptek Typhon model and the mariner model. The additional magazine capacity does not affect the nine shot models – those remain unchanged.

All of the guns have a tri-rail forend for mounting a light. Additionally, all of these guns have a 18.5″ heavy wall barrel standard.

Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is


  • Jianim

    So the mag tube is a couple inches longer and they are 7 shot 18.5″ barrels? A simple and past it’s time upgrade? Good. Now lets get the idea going that spare mags should be a couple extra rounds as well.

  • Madcap_Magician

    Oh good, had me worried there that it meant “+1 NEW AND REVOLUTIONARY: NOW MOSSBERG CAN HAZ KRYPTEK FINISH IN NEW COLOR!”

  • 12judges

    Love the 590 series but have always wanted them to come out with a version that takes some readily available choke tubes. Hope you’re listening Mossberg…

    • Spencerhut

      The barrels are plenty thick. I just have my 930’s and 590’s cut for chokes. Not that expensive.

  • JumpIf NotZero

    That would be too meta for a company that carries a -2 connotation.

  • Fruitbat44

    As an armchair gunslinger I would still express a note of caution about reliability; fitting six rounds into a magazine originally designed for five, hmmm . . .

    Of course, and hopefully, I may be worrying needlessly.

    And whether it’s actually practical or just tacti-cool, I do like the look of the Kryptek pattern,

    • K.T. Huskyberg

      They added a +1 mag extension in place of the barrel nut. They’ve been available aftermarket since Jimmy Carter was president.

  • Kelly Jackson

    I like how you can just buy this gun now. I don’t have the time to invest getting the required kills to unlock that camo

  • DIR911911 .

    you can’t carry a round in the chamber of a pump gun . . . you’d deny yourself the sight of the bad guy crapping himself when he hears that round rack into place 🙂

  • Dual sport

    I’m still waiting on them to offer a shorter stock that isn’t meant for you to go bird hunting with your tactical shotgun.

  • Chase Buchanan

    Why is there no bayonet lug? This is unacceptable!