@cmshoot thoughts?Okay, so how many have heard of 9310 bolts failing? Lots of manufacturers have shifted to 9310. For over a decade, the C-158 vs 9310 debate has continued. The carrier is standard 8620 steel while the bolt is 9310, as described on Aero's website. I have several of these exact BCGs and now have a few more coming my way.
Faxon Firearms seems to like the 9310 steel and I really like Faxon's barrels, so that is good enough for me...
https://faxonfirearms.com/blog/why-9310-steel-in-an-ar15-m16-bolt/