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Old September 13, 2020, 07:24 AM   #20
Nathan
Senior Member
 
Join Date: July 1, 2001
Posts: 5,481
It is my understanding that you hold the outside of the front ring of the receiver in the lathe. You adjust until a rod down the centerline of the bolt bore runs true. Then you face lugs, action face and single point cut threads. You might be better off to measure each of these before cutting as I’m not sure 0.001” or so would be worth cutting.

Then you hold bolt body (which can be hard). Some folks thread a custom cut block into the bolt shroud threads and then adjust in the lathe until the bolt body runs true. Then check/cut the front/back of bolt lugs until true and same for the bolt face.

There are fixtures available to make this all better/easier to setup.

BOLT

ACTION Mandral

ACTION Jig

Or ACTION/BOLT/BARREL Truing Jig

Last edited by Nathan; September 13, 2020 at 07:33 AM.
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