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Same issues with 9310. It's cheaper to buy in bulk compared to C158.
I'm all for mil-spec, if there was anything truly better, it would've been fully adopted i assume. I was curious and thought about it. I think the only benefit for an S7 carrier would be the added weight maybe.
I'm deciding against it. Standard stuff is all I'll need. The critical heat treating concerns me, the probabilities are too high to fully trust it. I've personally never had a bolt break on me yet, just one extractor on my first build.
Thanks for the info.
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S-7 when heat treated and tempered for ultimate strength, will have a C-scale hardness of 54-57. This is not a problem for the extension. A nitrided surface is over 60 C- scale. Making a carrier out of S-7 is a waste. An 8620 carrier will out live you. The only problem with S-7 is it is not forgiving in heat treat. If it is not done precisely, you most likely will have a brittle bolt. You can not allow S-7 to cool below 120 degrees before tempering. I recommend double tempering. Craig
Same issues with 9310. It's cheaper to buy in bulk compared to C158.
I'm all for mil-spec, if there was anything truly better, it would've been fully adopted i assume. I was curious and thought about it. I think the only benefit for an S7 carrier would be the added weight maybe.
I'm deciding against it. Standard stuff is all I'll need. The critical heat treating concerns me, the probabilities are too high to fully trust it. I've personally never had a bolt break on me yet, just one extractor on my first build.
Thanks for the info.
Its a big problem in this industry is that "enhanced" products never release their testing data. I found many manufacturers unwilling to respond to inquiry regarding such data. Or, if they were willing to respond, they fell back on protecting their intellectual property. Understandable, but without the data how can we determine which products are truly enhanced?
I did my own digging and found data from a reliable source which introduced a method of cold work hardening the bolt which doubled the life of the bolt over a standard C128 bolt.
Whats interesting is that this process uses a standard milspec bolt and gives us *quantifiable* gains in bolt life without fancy bullshit coatings or major changes to the lug geometry.
I talk about it on my article:
The Data Driven AR15
Low plasticity roller ball burnishing of the bolt is a low hanging fruit for a manufacturer to grab and their is data to back it up as a data driven step foreward in the enhancement of the AR15 bolt.
I hope someone can produce this product and integrate it into their product line.