Not a good idea to put a vertical forgrip on a pump, but hey customers don't always listen.
Perfect shooters like those Trap and Skeet Champs rack the weapon straight back. The rest of us all tend to torque the forend. When you put a vertical forend on a pump this acts as a lever and causes over-torque of the action bars. Soon they start binding and the guy can't figure out why his pump is not as smoth as it once was. I can always tell when one of these tacti-fool things have been on an 870. When I remove the forend tube assembly and look one action bar with be twisted in and pointing down and the other twisted out and pointing up. No wonder they are binding in the action. You can also look at the wear on the mag tube and see dominant wear on one side of the tube.
The above issue would not be as predominant on the MCS due to the shorter stroke and much depends on the shooter. However guys want to put mess like this on their other weapons and can plan on replaceing the forend tube assembly every few years, of course depending on how much they shoot and how much they torque the forend. I simply refuse to use them so the client can do what he wants after he gets the weapon from me. I also void the warranty for any damage one of these things does.
Now someone will post in how they have had a vertical forend on their 870 for 20 years and no such damage has occured. To them I say, "Cool beans" you are a great shotgunner and rack straight back. Me, I am very human and tend to torque and would rather not have anything on my weapon that causes damage.
J.D. McGuire, Owner
AI&P Tactical, LLC
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