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Shockwave Grip Push Button Swivel Base Project

Discussion in 'Mossberg 590 Shockwave' started by oldreb, Jun 19, 2018.

  1. oldreb

    oldreb Copper BB

    For this project, you will need:

    Grovetec Snap Hook Multi-Adaptor GTSW281
    (These bases accept any standard push button swivel.)
    1. Drill press or handheld drill with vise
    2. Measuring tape/tool
    3. 1/8” drill bit
    4. 1/2” Forstner drill bit
    5. Tap wrench & 9/16”-18UNF-2B tap
    6. CR-V 1/4” screwdriver hex bit or hex key
    7. Solvent or 90% alcohol
    8. JB Weld or other epoxy
    Drill 1/8” center pilot hole between bottom of bolt hole & edge where back of grip meets bottom of grip — roughly 1 3/4” from bolt hole edge.

    Using pilot hole as a guide, drill 1/2” (.500) (or 33/64” (.515) ) hole using Forstner bit to 9/16” to 5/8”D.

    Note: hole depth should be exact so button base fits flush at top of hole so base and swivel work properly. If you don’t have a depth gauge, cut a coffee stirrer etc. to accurately match depth of base. Take your time — cut, measure, cut, measure to proper depth. Frequently, stop to clean hole out.

    Tap hole with a 9/16”-18UNF-2B tap.

    Use CR-V 1/4” screwdriver hex bit or hex wrench to screw button base into grip. Check for fit. Make sure it is flush. If not, you will need to fill hole with removed drilled filings or other plastic/rubber material to insure flush fit.

    Once you have that nailed down, remove button base, degrease threads, coat lightly with JB Weld, reinstall and let cure.

    Voila... you have a grip swivel base that can use an HK hook or button swivel as needed!
    Rossignol likes this.
  2. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Good tutorial.

    If you have some pictures of how it looks once you're finished, I know we'd all like to see them.
  3. oldreb

    oldreb Copper BB

    5AB6C05B-1025-4323-8487-6521EBE3661E.jpeg 14030010-843B-4C63-B60A-42A5482AD762.jpeg
    Last edited: Jun 22, 2018
    Rossignol likes this.
  4. Chuck Deuce

    Chuck Deuce .22LR

    Looks a bit more secure than the factory offering.
  5. -FvieFiveSIx-

    -FvieFiveSIx- Copper BB

    Did this last summer.. Also installed a socket in the mag cap.. works well

    gun3.jpg gun2.jpg
    JEB likes this.

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