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Questions & Answers
Will this work on a mossberg 590m shockwave? Expert Answer

Yes, MPN: 4454 will fit.

by Jonathan D., Gear Expert, October 23, 2019
Will this work for Mossberg tactical 18.5 barrel #50778 Expert Answer

Yes. The correct Ergo Grip Tactical Shotgun Stock Adapter for a Mossberg 590 12 gauge (50778) is MPN:4454.

by Ethan, Gear Expert, May 12, 2022
Customer Reviews
Helpful Positive Review
Great Price, Great Fit by Caleb, Verified Owner, June 26, 2024
Economical way to accomplish your conversion. Fit a commercial buffer tub just fine. MOE grip locked up. ��
1/1 found this helpful
Helpful Positive Review
there isn’t a set screw by Ron, Verified Owner, December 29, 2024
I like this adapter. This my fourth one. This picture shows looks like a set screw to keep the buffer tube angle straight up and down. Which is very good to have. But there isn’t one and no place for one. So I have to dill and tap for my own set scre...
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1/1 found this helpful
Helpful Positive Review
Shockwave Must Have by Blake, Verified Owner, August 13, 2021
Used this adapter with DoubleStar brace and the shockwave is freaking awesome now. Super short length of pull. Folks complain about the ERGO angle vs. the Mesa Tactical angle of “stock” or brace. I don’t understand how the shockwave could possibly be...
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1/1 found this helpful
Helpful Positive Review
fits my mossberg 590 shockwave by george, Verified Owner, January 5, 2022
I wanted to add a brace and pistol grip to my shockwave and this came in clutch. Took 15 min total to install everything. The only issue I had was it was a little hard to get the buffer tube to start threading into the adapter.
1/1 found this helpful
Helpful Positive Review
I got this adapter after returning the Tac Star adapter, because the cant was too high and I couldn't use the bead sight on the shockwave. This adapter by Ergo has the right drop for a good check weld and is sturdy during shooting. Fitted with your f...
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1/1 found this helpful
Helpful Positive Review
I installed this on an H&R pardner pump 12 Guage which is a Remington 870 clone. Went on perfectly with no issues. This adapter also has a set screw for the buffer tube so you don't have to use a castle nut which I really liked since I was putting on...
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5/5 found this helpful
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3 Models Available
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Product Info for Ergo Grip Tactical Shotgun Stock Adapters

Use the Ergo Grip Tactical Shotgun Stock Adapters to install any combination of AR15 stocks or pistol grips onto your Remington or Mossberg shotgun. These Gun Parts made by ERGO are constructed of glass-filled polymer that's durable yet lightweight, and these adapters are compatible with both commercial and Mil-Spec buffer tubes. This Tactical Shotgun Stock Adapters is also compatible with factory sights including bead, rifle and ghost ring designs. Expand the functionality of your weapon with the help of this ErgoErgo Grip Tactical Shotgun Stock Adapters.image

WARNING: California`s Proposition 65

Specifications for Ergo Grip Tactical Shotgun Stock Adapters:

Manufacturer: ERGO
Condition: New
Color: Black
Gun Make: Remington
Gun Type: Shotgun
Fabric/Material: Glass Filled Polymer

Features of Ergo Grip Tactical Shotgun Stock Adapter

  • Use any style AR stock/brace and pistol grip combination
  • ALL NFA RULES APPLY
  • Accommodates mil spec or commercial buffer tubes
  • This adapter has the proper drop designed in, so factory sights can be used. (Bead, Rifle, and Ghost Ring Sights)
  • Made from glass filled polymer
  • Includes mounting hardware

Package Contents:

  • Ergo Grip Tactical Shotgun Stock Adapters
  • Mounting Hardware

Ergo Grip Tactical Shotgun Stock Adapters Orderable Models

List of Orderable Models

  • ERGO Grip Tactical Stock Adapter, Remington 870, 20 Gauge, Black, 4455 , MPN: 4455 , UPC: 874748009089 , Code: 3E-STA-98SQ-4455
  • Ergo Grip Tactical Shotgun Stock Adapter-Remington 870, 4453 , MPN: 4453 , UPC: 874748005166 , Code: 3E-STA-98SQ-4453
  • ERGO Grip Tactical Shotgun Stock Adapter f/Remington TAC-13, 12 Gauge, Aluminum, Hard Black Anodized, 4457 , MPN: 4457 , UPC: 874748009249 , Code: 3E-STA-98SQ-4457

Ergo Grip Tactical Shotgun Stock Adapters Unavailable & Discontinued Models

List of Unorderable Models

  • USED Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454, EDEMO4, Used, Condition Fair , MPN: 4454-EDEMO4 , Code: 3E-STA-98SQ-4454-EDEMO4
  • USED Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454, EDEMO5, Used, Condition Fair , MPN: 4454-EDEMO5 , Code: 3E-STA-98SQ-4454-EDEMO5
  • USED Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454, EDEMO7, Good, Inspect and Rebox , MPN: 4454-EDEMO7 , Code: 3E-STA-98SQ-4454-EDEMO-RE-C
  • USED Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454, EDEMO8, Excellent, Inspect and Rebox , MPN: 4454-EDEMO8 , Code: 3E-STA-98SQ-4454-EDEMO-RE-B
  • ERGO Tactical Stock Adapter, Mossberg 500/590 - .410 gauge, Black, 4456 , MPN: 4456 , UPC: 874748009133 , Code: 3E-STA-98SQ-4456
  • USED Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454, EDEMO6, Used, Condition Like New, Inspect and Rebox , MPN: 4454-EDEMO6 , Code: 3E-STA-98SQ-4454-EDEMO-RE-A
  • Ergo Grip Tactical Shotgun Stock Adapter-Mossberg 500, 4454 , MPN: 4454 , UPC: 874748005173 , Code: 3E-STA-98SQ-4454
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