AR15 Trigger Pinholes: 5/32", but pinhole resin is 80% less loose when using a 5/32" bit This #23 bit makes perfectly sized holes in the polymer bases for solid trigger pins.FYI, using a 'U' size bit for the safety selector pin holes is also fine if you're only going with a 3 /8 hand drill "bit and the selector is stuck too.
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