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Jimro · July 16, 2013, 02:00 AM

There is no "correct timing" for barrel fluting unless you care about looks.

The radial symetry of the fluting allows for any orientation, so just install and shoot. If you care about having an unfluted portion of the barrel at the 12 o'clock position, just have your gunsmith cut the shoulder back until that is the case before he sets final headspace.

Or if you are doing the work yourself, a standard Mauser thread pitch is 12 per inch. That means 0.083" inches travel per rotation. So if you need to move a 6 fluted barrel (one flute every 60 degrees) 30 degrees (halfway between flutes) then you are looking at making a cut on the shoulder about 0.0069" not including leaving some on for final torque. For a 5 flute barrel it would be slightly deeper, but the math is the same and your gunsmith knows how to do it.

Anyways, I'd just make sure the reciever is trued up, install the barrel and not worry where the flutes end up.

Jimro

July 16, 2013, 02:00 AM	#17
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	There is no "correct timing" for barrel fluting unless you care about looks. The radial symetry of the fluting allows for any orientation, so just install and shoot. If you care about having an unfluted portion of the barrel at the 12 o'clock position, just have your gunsmith cut the shoulder back until that is the case before he sets final headspace. Or if you are doing the work yourself, a standard Mauser thread pitch is 12 per inch. That means 0.083" inches travel per rotation. So if you need to move a 6 fluted barrel (one flute every 60 degrees) 30 degrees (halfway between flutes) then you are looking at making a cut on the shoulder about 0.0069" not including leaving some on for final torque. For a 5 flute barrel it would be slightly deeper, but the math is the same and your gunsmith knows how to do it. Anyways, I'd just make sure the reciever is trued up, install the barrel and not worry where the flutes end up. Jimro __________________ Machine guns are awesome until you have to carry one.