Toughest bolt on the market - Sharps Rifle Company Xtreme Performance Bolt

As mentioned in the other reviews, S7 tool steel has twice the tensile strength, but it also has far more impact strength. It's very unlikely you'll shear off any lugs on this thing. I have a Sharp's XPB bolt and carrier already, but snagged another bolt to put in a WDR titanium carrier. Light carriers move much faster, so having a bolt that can take more stress only makes sense to me. No problems with tolerances, passed headspace checks on a custom Black Hole barrel as well as a cheaper Faxon Gunner barrel. One thing you might consider is a extractor upgrade spring and o-ring kit from BCM, I'm pretty sure Sharp's only uses an o-ring, so the spring could help if you're out in very cold weather and have extraction issues.