AR-15 Castle Nut Wrench
thingiverse
A castle nut wrench for AR-15 style rifles. Small and portable. Recommend cutting from steel on a laser cutter, but any material would probably work, you don't need a lot of pressure. Wow! Lot of love for this model. I uploaded some pictures showing my version that I laser cut out of 3/16" Cold rolled steel on a massive Amada laser cutter.
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