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.
Good to know. An adjustable gas block will go on my upcoming 264 LBC re-barrel.
