The QPQ bcg craze hit soon after the NiB BCG craze. It has a lot going for it, and a very long history of being used to treat metals for various hard-use applications.
Since it came out in vogue for bolts in BCG's (JP used it for a long time in carriers, but I believe RCA was the first to treat bolts), I have also noticed that several who used to use C158 for bolts, now use 9310. Is this because their suppliers changed, or did they note that the 9310 performs better when QPQ processed? I do not know. That is beyond me.
However, I have yet to see either in person, or on the internet, a broken 9310 QPQ'ed bolt. I have seen some that have gone well past 25K rounds, with some reported at 50K+, but I have yet to see a picture or hear a take of one that broke.
Has anyone else seen a broken 9310 QPQ bolt?
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