I was just able to make a bulk purchase of these awesome step drills that are surplus from Boeing Aircraft in Seattle. They have been machine resharpened and inspected. The pilot tip is 1/8 inch (.125) with a 135 degree 2 flute head. The second step is 3/16 (.1875). These bits work perfectly in my JForm tools and also in my combo DC and DW center guides. You can't drill a more perfectly centered hole than this unless you go out and buy a lathe.
To purchase, go here
Discussion on building a legal form 1 suppressor
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