05-08-2019, 09:23 PM
Kswhitetails Wrote:A5 - in the ar15, the overall variation and departure from the ideal of the ratio is much less pronounced than it would be for the Anvil. There's obviously a pretty wide envelope for the 15, considering all the variations that so many folks find relatively easy ways to make work, especially considering how many amateurs are out there putting together our Lego sets. 3.2-2.8:1 vs 6.5:1-ish etx...
I'm no metallurgist. And I'm making a fool of myself asking; but why hasn't anyone made a super-steel bolt that would do what we're asking? Surely there's some kind of solution without re-inventing the entire wheel? Ti bolts with the proper heat treat, or Inconel blend? I'm sure it has something to do with the strength to flexibility ratio...
I can tell you right now there is 2 grades of steel that could it it. But the finished bolt would be in the 200 dollar range.
The problem isn't metal flex, it's the compression strength.
Over repeated firings the steel molecules get so compressed and that's what causes the failure i.e. bolt lug breaking free.
So it's not just the physical strength of the steal but the steals strength to resist compression and in doing so resist core and surface fractures that cause lug failures.
Titanuim would work fine but the heat treat and any surface treatment has too be top shelf on the jiffy spot or it will shatter like glass.
So that leaves us with 2 ways to accomplish what we want. Use steel or titanium that will jack the pricing of the bolt too be so high no-one will buy it.
Or redesign the very bolt lug too extention ratio itself. Meaning leave the old lug pattern beihind and drop down too a 4 or 3 lug design, with beveled edges and a .125 boltface depth.