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I know a lot of people are just drilling their barrel pin channels then tapping in the pin, but I have a feeling some folks are going to be running into some headspace issues down the road if there's not enough of a press fit.
I've been testing on some square bar stock and the best fit I have found is by using a #24 drill bit, then chasing it with a #22 reamer, then installing a 4mm dowel pin cut to the proper length. You can get the bit and the reamer at mscdirect.com.
I've been testing on some square bar stock and the best fit I have found is by using a #24 drill bit, then chasing it with a #22 reamer, then installing a 4mm dowel pin cut to the proper length. You can get the bit and the reamer at mscdirect.com.