A fairly common thing. Custom machinist-gunsmtihs can build you a hyper-precise rifle. Most people won't invest the money since they'll never, ever in this lifetime come close to shooting out a barrel.A few custom barrel makers I've spoken to would roll me a match SS barrel substituting an Armalite barrel extension and would headspace if I sent them a bolt. I would prefer a common and more mass produced barrel.
Kinda like the false economy of building a $3,000+ rifle system to use cheap plastic magazines and ball ammo, then bitch that it holds groups like a pawn shop Savage.
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