Remington 870 12 GA Shotgun Forend Nut Removal Tool
thingiverse
Didn't want to order a forend nut removal tool so I figured I'd try to make my own. Its designed for a Remington 870 12 GA, but I think they're generally similar? The hex head takes a 16MM socket. Tried it on a nut from 1977 and it immediately sheared the tabs off. Removed it with needle nose pliers (and two of us twisting), then reinstalled / removed and it worked well. Definitely won't help you with the pesky, stuck ones but should work well enough if its more reasonably tightened? I printed it in CURA, vertically, out of PLA and used the default support settings (which made a concentric circle around the tool to support the tabs).
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