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Ergo Grip M-LOK Shockwave Mossberg 500/590 Tri Rails
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Most Helpful Positive Review Easy install and perfect fit on my Mossberg 590M
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 installed on the barrel and this forend does not interfere with it like other forends will, i.e. the Magpul M-lok forend. The M-lok slots were to spec and I was able to install accessories easily. The provided rail covers were a plus as well.
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Fits 590M with 18.5 barrel

by Conrad, Verified Owner from CO, United States Written on 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 or gloves.
Would recommend: Yes
1 of 1 found the following review helpful.
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ERGO-mazing!

by UKBigBlue, from KY, United States Written on 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 is kind or smooth.
Pros:
  • ergonomic
  • streamlined
  • Can Add Accessories
Cons:
  • None
Best Used for:
  • Home Defense
Would recommend: Yes
4 of 4 found the following review helpful.
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