I can personally vouch for tp555's work. He did both my 223 and 300-221 uppers. I haven't busted the cherry on the 300-221, but the 223 upper will put bullets through the same hole at 100 meters.
Also he will give you the 5/8-24 threading with thread protector so long as you remember to specify it in the order. I think he defaults to Douglas Premium barrels in 1:8 twist if you don't specify. Best to ask. He will also put the gas block / port in the pistol position. You might like his three way blocks.
As long as barrel extensions are available, he should hook you up fairly quickly.
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