The only thing I'd add to your procedure would be to recheck the headspace after final tightening. The barrels are threaded at 20 threads per inch, so one turn is equal to .050" Changing a bolt head obtained from a reputable source should keep your headspace difference less than .001 if there's any change at all. Thats equal to 1/50th of a turn of the barrel, hardly enough to affect the timing of your muzzle brake. Being off a bit won't hurt it at all, but there's always that one guy that'll let you know it's not indexed. The brakes are screwed on to the barrel, a good gunsmith could shim it in a matter of minutes to index it correctly.
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