Octagon M-Lok Hand Guard Bumper.
thingiverse
I needed a guard to go around the end of my M-LOK hand guards to stop them from knocking into each other in the safe. This should fit most Foxtrot Mike or PSA guards, but you will likely need to scale it to meet your needs. The outer edge is 40mm, the inner is 38mm - do your math appropriately. If you want to tinker with it as opposed to scaling it, here you go: https://cad.onshape.com/documents/0eeab7d69443814ab9f42f94/w/207868ba16fdc6625dbddbd9/e/51f0eba9c056bf8226c8c9fb
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