I don’t see how. There is a reason the the military has specified forged receivers on every military rifle from the 1903 Springfield to the M16. You get a true grain flow in a forging that aids in the overall strength. When you mill a piece of bar stock (same as making a billet receiver), you cut those grain flows.
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I do know this. I’ve put together more performance engines than I care to remember. I’ve seen engines built personally that have any where from 150 to 3000 hp. The ones that stay together longer ALL had forged internals. No exceptions. Reason? Stronger. Why? Exactly the reason cmshoot said. Casting disrupts the molecular makeup of a certain metals and billeting from stock cuts through the molecular makeup. Forging keeps them aligned thus keeping the strength. If you buy a billet piece for a car build it is purely for aesthetics and not because of any undue pressure being put on that part.