By the way, the new Bergara HMR Pro has the Trigger Tech installed at the factory. It is an all stainless steel design (bolt, receiver, barrel). Looks like a superb rifle.
My B14 HMR has the machined/milled bolt shroud, no issues with that either.
The Bergara factory has adressed the flaws this...
In late 2018 Bergara changed the firing pin diameter from 2.00mm (0.07874 inches) to a smaller diameter (1.7mm or 0.06693 inches). Also the gap between firing pin and bolt is tighter. New rifles produced in 2019--> has no problems with cratered primers in my experience (I have the B14 HMR in 6.5...