Here it is:

http://www.alloutdoor.com/2014/01/08...ia-bolt-ar-15/

The Sharps Relia-Bolt. I'm just not liking the Np3 coating, the untested S7 steel (in this high shock-loading and repetitive temp-cycling capacity), or the altered lug profile. But, I could be off and it could be a leap forward.

Can a metallurgist (or somebody familiar with S7 tool steel) opine on this?