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

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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