Never had a problem with a broken bolt with the 6.5 Grendel and that is after many, many rounds through many Grendel builds. The only issue I have had is wear on the upper receiver and bolt carrier from excessive bolt thrust. In other words "Over gassed". A long time ago I started using a adjustable gas block on all my Grendel builds and it was no longer a issue.

Without a adjustable gas block I have had a 6.5 Grendel carbine completely destroy a Enidine buffer in less than 100 rounds.

All the best things in life, live on the other side off fear.

The true eye sees not the despair of its victims, only the elegance of equilibrium. It's a demonstration of superior judgment.