From the information I've found I think these Superbolts are more durable than the standard Mil-Spec bolts if for no other reason than the physical design features. The problem for me, however, is from an armorer's perspective I can't recommend them for duty use because they represent somewhat of an unknown compared to the standard.
I know what to expect in terms of service life from a standard bolt and I know that they are reliable enough within those constraints to trust for duty use. Until these have been used and abused in documented high volume testing I couldn't use them in our duty rifles.
Having said that, since I think they are stronger I am seriously considering a couple for my wildcat AR's. Since I tinker with different loads in those guns, most of which are higher energy and possibly higher pressure than standard 5.56, a stronger bolt has appeal and if my belief is wrong it won't be during a firefight when the bolt fails.
Just my take on it.
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