To get the forearm off a Mossberg 500 action slide there is a nut that needs to be unscrewed. One type of tool that will do the job (pictured immediately below) is like a crescent wrench with teeth. It goes around the nut and is known as a "spanner wrench."



Another tool, pictured below, fits over the action tube and slides down to engage the slots in the nut. It is sold (with a very descriptive name) as a "Forearm Removal Tool."
Is there a formal name for this tool:



Thanks in advance

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Somewhat similar to a castle nut/wrench or spanner wrench used on an AR

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"Forearm removal tool" sounds like a carelessly used skil saw.

I personally would go with "thingamajig." I would hope that would not be too technical a description.

John

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I’ve always seen any wrench that works like that called a spanner wrench... even when circular.

I was able to find both kinds for sale by searching “forearm removal tool”. But what about the hoplophobic mechanics? In good conscience we must make it a priority to establish non-aggressive but technically sufficient descriptive nomenclature for them as well (all two of them) Therefore, as a public service I thought to propose: “Radial armed tubular spanner wrench”. But then I realized that “armed” in the name, bringing to mind present tense weaponization, could be even worse than “forearm,” which, from a temporal but still existential perspective, is but a presage of future lethal instrumentalities.

So instead I am left to propose: Radial appendaged tubular spanner wrench”

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I vote for doohickey.

That’s what I’m calling the next joker who cuts me off in traffic.

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Brownell's has the Remington version for the 870/1100 catalogued as a "Forearm Wrench" if that helps!

Smiles,

Another tool, pictured below, fits over the action tube and slides down to engage the slots in the nut. It is sold (with a very descriptive name) as a "Forearm Removal Tool."
Is there a formal name for this tool:



Thanks in advance[/QUOTE]

Looks like the tool I use to tighten the timing chain on my Jaguar 4.2 liter engine.

Man, dude, that's totally a "tubular" spanner wrench!

It has two names.
1. That damn thing i can't find!
2. This damn thing that I don't need and it's in the way.