Nerf Large Open Ring Sights for Picatinny
thingiverse
A big open ring, don't need super accuracy on a foam blaster. I used TronskiFPV's Picatinny attachment part. It's very tight, might need filed or sanded down, but fits nice and snug from friction and you don't need to screw around with a mechanical fastener. Maybe even scale it up a few percent.
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