1. Check out the Hot Deals section of the Marketplace forum to order an official Mossbergowners.com hat.

Plus One Magazine Extensions That Work?

Discussion in 'Mossberg 590 Shockwave' started by Warhammer, Feb 25, 2020.

  1. Warhammer

    Warhammer .410

    I've already tried the S&J Hardware +1 for the 590 and it did not actually let me get an extra round in the tube.

    The Suarez unit is supposed too have been specifically made for the Shockwave and actually add a round. But it's no longer p\on their website. They seem to be heavily invested in the Tac-14, so they may have stopped making the Mossberg +1.

    So has anyone added a +1 to your Shockwave that works? Which one?
  2. Warhammer

    Warhammer .410

    Possible options:

    S&J Hardware (didn't work) - $57
    Vang Comp (590 & 590A1) - $75
    HFD2 w/standoff spike (claims to be for 590, 590A1 and Shockwave) - $62
    Nordic Components (universal) - $85
    Taccom w/standoff pasta fork (590 & shockwave) - $53
    Choate (590A1) - $45
  3. BoBo522

    BoBo522 .22LR

    I am using the S&J +1 and can just get nine 1 3/4" minishells in the tube, using the stock spring and the Derlin follower that came with the S&J. It will also accommodate a fifth 3" shell but it's not long enough for a sixth 2 3/4" shell - needs to be at least 3/4" longer. Perhaps the +2?
    Warhammer likes this.
  4. serega12

    serega12 .22LR

    No answers on this one?
  5. Bobster

    Bobster .30-06 Supporter

    Did they give you a replacement spring to install? It may be too long and "stacking" up inside the tube. See how the +1 works with the factory spring--maybe that is all you need?
    serega12 likes this.
  6. Cruzie27

    Cruzie27 Copper BB

    Anyone have a picture of a Shockwave / Nightstick with the S&J +1?
  7. m-forgery

    m-forgery WESCOG Wile E. Coyote School of Gunsmithing Elite Member

    20210212_171119~2.jpg Here is my 590 Shockwave with the S&J Hardware plus one.

Share This Page