Lietner Wise (as in LWrc) is the person that first started using "9310" and founded LWRC. I found an engineering paper he wrote on it in 2007. Shortly after that a nurse and hardwood floor guy got Lietner Wise fired from his own company and they took over. A few years later they merged or were purchased by a large machine company. The first few years the nurse and hardwood guy ran the company they ran the heat treat on those bolts up so hard they were brittle and cracking but they figured it out a few years later. The bolt is a copy of the LMT but uses 9310 instead of Carp 158. LMT was a real military contractor so their parts had to meet military specs so they used Carp 158 even though 9310 had a better charpy value.I run that very bolt with a 16" DD 5R 1:11 barrel. There are some interesting design features to aid in reliability and accuracy. The dual extractor spring design that's claimed to last 3x longer and provide higher force for the claw to grip the case rim, the relief channel all the way around the outer perimeter to allow grit / debris from interfering with how the case head interfaces to the bolt face (claimed to increase consistency of seating and possibly reliability under heavy fouling) and the lack of under cuts for the extractor pocket that weaken the two lugs on either side of the extractor on typical bolt designs.
The bolt is also NiB plated, mine cleans up quite easily and doesn't accumulate carbon residue like phosphate does. I will say this is the nicest AR bolt I've ever used. While they do not specify the material, I believe it is ASE 9310 which is around 7% to 10% stronger than Carpenter 158 and has become quite common. So you can either buy two Daniels Defense carpenter 158 bolts or a single LWRC.
I chose LWRC on this one. Since these are all new parts, no worries on head space and the lug lengths on the LWRC bolt are spot on to spec with my calibrated micro-meter.