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Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails

01:15
ERGO Grips M-LOK Shockwave Mossberg 500/590 Tri Rail, Black 4256-BK, EDEMO1
EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
USED ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO3, Condition Fair, Defective
EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
1 of 1 videos
Ergo Grips - Which size forend will fit my Mossberg 500/590?
ERGO Grips M-LOK Shockwave Mossberg 500/590 Tri Rail, Black 4256-BK, EDEMO1
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ERGO Grips M-LOK Shockwave Mossberg 500/590 Tri Rail, Black 4256-BK, EDEMO1
EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
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EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
USED ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO3, Condition Fair, Defective
3 of 10 images
USED ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO3, Condition Fair, Defective
EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
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EDEMO ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK, EDEMO2
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK
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ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK

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Questions & Answers
Will this fit a maverick 88? Expert Answer

The Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails might work for the Maverick 88. I recommend contacting Ergo Grips to confirm compatibility.

by Hunter, Gear Expert, February 23, 2023
Will this work for the 14" barrel Shockwave? Expert Answer

The Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails should be compatible with your Shockwave. You can measure your slide action assembly to confirm fitment. It should measure 5 13/16" in order to fit this rail.

by Ethan, Gear Expert, May 25, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
ERGO-mazing! by UKBigBlue, October 11, 2019
Great upgrade for the shockwave, cuts down on the bulk and allows for mlok accessories such as weapon lights. This really allows you to optimize the shockwave for home defense. I would recommend some type of mlok rail covers as the anodized aluminum ...
Read More...
4/4 found this helpful
Helpful Positive Review
Easy install and perfect fit on my Mossberg 590M by Julius, August 27, 2020
Ordered this to replace the OEM forend on my Mossberg 590M. Note that item #4256 is the correct size for the 590M. Took about 10 minutes to install using the parts included and forend wrench (no need for any adapter nut). My 590M has a heatshield ins...
Read More...
6/6 found this helpful
Helpful Positive Review
Fits 590M with 18.5 barrel by Conrad, Verified Owner, May 2, 2022
This fit my 590M that Mossberg sells as the tactical version. The short model fits perfectly. I would recommend a vertical forgrip or something similar. The forend is very minimalist, you'll have a hard time using it with a heat shield without a grip...
Read More...
1/1 found this helpful
Read All 3 Reviews
Color:
Black
Finish:
Hard Black type III Anodized
Fabric/Material:
6061-T6 Aluminum
Gun Make:
Mossberg
Gun Model:
Mossberg Model 500, Mossberg Model 590
Handguard Length:
5.8 in
Gun Rail:
M-LOK
Included Accessories:
3 Black 4332 M-LOK Rail Covers
Condition:
New
Gun Type:
Shotgun
Mount Type:
M-LOK
Quantity:
1

Code: 3E-2RF-SRFM-4256-BK

MPN: 4256-BK

UPC: 874748009102

Product No Longer Available

Product Info for Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails

Install this Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails to customize your shotgun with laser sights, weapon lights and other tactical accessories. ERGO built these Shotgun Forends & Handguards from durable anodized aluminum that's corrosion-resistant and lightweight, and the low-profile design takes up minimal space while providing maximum utility. Each M-LOK Shockwave Mossberg 500/590 Tri Rails features 3, 6 and 9 o'clock M-LOK rails for mounting compatible accessories. Add all the sights and accessories you need for target practice or hunting by equipping the Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails.image

ATTN: Mossberg uses two different length slide action bars on the Shockwave model. One measures 5 13/16" and the other measures 6 15/16". You need to confirm the length of you particular model prior to ordering. 

If yours measures 5 13/16" use part # 4256 and if it measures 6 15/16" use part # 4872.

Features of ERGO Grips M-LOK Shockwave Mossberg 500/590 Tri Rail:

  • Mossberg 500/590; 5 13/16" length; M-LOK
  • Included Accessories:
  • Includes 3 black M-LOK rail covers

Package Contents:

  • Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails
  • Includes 3 black M-LOK rail covers

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Mossberg 12 Gauge All Purpose Barrel, 28in, 6 Shot, Matte Blue 90123
List: $280.00 (Save 14%)
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BlackHawk Nylon Ambidextrous Multi-Use Holsters, Ambidextrous, Black, 40AM36BK
BlackHawk Nylon Ambidextrous Multi-Use Holsters, Ambidextrous, Black, 40AM36BK
List: $34.95 (Save $2.06)
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Mossberg Flex Standard Forend Synthetic Mossy Oak Infinity Camouflage For Flex 500/590 Only
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List: $71.99 (Save 20%)
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Tufloc Floor Mount Vehicle Rack
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Choate Tool Moss 5500/9200 Conventional Stock,12 Gauge, CMT-02-01-32
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List: $91.99 (Save $8.00)
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Mesa Tactical Mesatac Shotgun Vise Blocks, Mossberg Model 500, Blue, 92780
Mesa Tactical Mesatac Shotgun Vise Blocks, Mossberg Model 500, Blue, 92780
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Mossberg 90121 500 12 Gauge 24'' Blued Adjustable Rifle
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Tufloc Trunk Mount Vehicle Rack
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Gun Parts and Accessories

1–21 / 21
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On Sale
Mesa Tactical LEO Gen II Hydro Recoil Starter Pack
Mesa Tactical LEO Gen II Hydro Recoil Starter Pack
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Mossberg Heat Shield for Model 500 590 Marinecote
Mossberg Heat Shield for Model 500 590 Marinecote
(1)
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$61.79
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Limbsaver AirTech Precision-Fit Recoil Pad f/Wood Stocks
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(6)
List: $44.30
$43.99
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KynSHOT Tactical Shotgun Conversion Kit
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GrovTec US Shotgun Side Mount
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(2)
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Limbsaver Classic Precision Fit Recoil Pads
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(7)
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$27.79
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GG&G Receiver Sling Mount, Mossberg 500/590 - Rectangular Version - Right Hand
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(6)
List: $49.23 (Save 25%)
$36.89
KICK-EEZ Pre-Fit KZ Recoil Pad, Mossberg Model 500, Mossberg Model 835, Black, KZ-103
KICK-EEZ Pre-Fit KZ Recoil Pad, Mossberg Model 500, Mossberg Model 835, Black, KZ-103
List: $63.99 (Save 13%)
$55.99
Mesa Tactical Anti-Walk Trigger Pin Kit, Mossberg Model 500, Mossberg Model 590 and Mossberg Maverick 88, Black, 92840
Mesa Tactical Anti-Walk Trigger Pin Kit, Mossberg Model 500, Mossberg Model 590 and Mossberg Maverick 88, Black, 92840
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GG&G Front Sling Attachment, Ambidextrous - Mossberg 590 - GGG-1084-2
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(3)
List: $17.60
$17.49
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Mossberg Heat Shield for Model 500 590 Blue
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$57.99
Jebs Choke Tubes Head Hunter Turkey Choke
Jebs Choke Tubes Head Hunter Turkey Choke
(3)
List: $100.00 (Save 15%)
$84.99
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Carlson's Choke Tubes 20 Gauge Flush, Winchester/Browning/Mossberg/Savage, Light Modified, .605 in, Stainless, 50100
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List: $27.50 (Save 15%)
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Hogue EZG Pre-sized Recoil Pad Mossberg 500 Synthetic Stock Black 05720
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GG&G Mossberg 590 Shotgun QD Sling Attachment
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(1)
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Mesa Tactical KynSHOT RB5100 Hydraulic Buffer, Black, 91320
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List: $248.95 (Save 16%)
$209.99
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Mossberg 95066 Parkerized Heat Shield Kits
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$67.99
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GG&G Mossberg 590 & 500 Quick Clip Rear Sling Attachment For HK Style Snap Hooks GGG-1284
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(6)
List: $48.99 (Save 23%)
$37.89
Mesa Tactical KynSHOT RB5103 Hydraulic Buffer, Black, 92240
Mesa Tactical KynSHOT RB5103 Hydraulic Buffer, Black, 92240
(2)
List: $234.95 (Save 12%)
$205.99
GG&G Mossberg 590 Looped Front Sling Attachment GGG-1434
GG&G Mossberg 590 Looped Front Sling Attachment GGG-1434
List: $33.99 (Save 43%)
$19.49
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Gun Grips

1–4 / 4
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Phoenix Technology Shorty Home Defense Shotgun Grip, Mossberg, Black, SGM01
Phoenix Technology Shorty Home Defense Shotgun Grip, Mossberg, Black, SGM01
(1)
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ATI Outdoors T3 Rear Pistol Grip
ATI Outdoors T3 Rear Pistol Grip
As Low As (Save Up to 17%)
$49.99
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TacStar Gun Grips
TacStar Gun Grips
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ATI Outdoors Shotforce Pistol Grip, Black, One Size, SRG0200
ATI Outdoors Shotforce Pistol Grip, Black, One Size, SRG0200
(1)
List: $41.44 (Save 20%)
$32.99
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Gun Sights

1–10 / 10
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14% Coupon
Crimson Trace LS-250 Lasersaddle Laser Sight for Mossberg
Crimson Trace LS-250 Lasersaddle Laser Sight for Mossberg
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As Low As (Save $12.04)
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XS Sight Systems Shotrail, Ghost Ring & Standard Dot Tritium Shotgun Sights, Mossberg
XS Sight Systems Shotrail, Ghost Ring & Standard Dot Tritium Shotgun Sights, Mossberg
(8)
As Low As (Save Up to $15.50)
$149.99
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Williams Gun Sight Wgos Fire Sight Set, Mossberg 500, Green/Red, 66370
Williams Gun Sight Wgos Fire Sight Set, Mossberg 500, Green/Red, 66370
List: $41.95 (Save 13%)
$36.39
XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights, Mossberg
XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights, Mossberg
(3)
List: $126.99 (Save $12.00)
$114.99
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Hiviz Magnetic Shotgun Sights, 2 Green and 2 Red Pipes, Fits 8.3mm-11.1mm Ribs M400
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List: $24.95
$24.89
Blazin' Deal
XS Sight Systems Winged Ghost Rifle Scope Rings w/Dot Front Sight
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Meprolight Tru-Dot Shotgun Night Sights for Mossberg Shotguns
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Final Sale
XS Sight Systems Shotrail, Ghost Ring & Big Dot Tritium for Mossberg
XS Sight Systems Shotrail, Ghost Ring & Big Dot Tritium for Mossberg
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Mossberg Ghost-Ring Sight Kit 500/590
Mossberg Ghost-Ring Sight Kit 500/590
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List: $129.99 (Save $8.00)
$121.99
Meprolight MPO PRO-F Reflex Red Dot Sight Mount, Mossberg Model 590/930, Black, 901141142
Meprolight MPO PRO-F Reflex Red Dot Sight Mount, Mossberg Model 590/930, Black, 901141142
List: $459.99 (Save $40.00)
$419.99
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Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails Unavailable & Discontinued Models

List of Unorderable Models

  • ERGO Grip M-LOK Shockwave Mossberg 500/590 Tri Rail, Black, 4256-BK , MPN: 4256-BK , UPC: 874748009102 , Code: 3E-2RF-SRFM-4256-BK
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Last updated 2026-09-11 UTC.