In the wake of the P320 frenzy.

Some Ruger Precision Rifles may experience interference between the aluminum bolt shroud and the cocking piece (also known as the firing pin back). In rare instances, the interference can disrupt the firing mechanism and cause it to not function properly.
Possible results of this interference are light primer strikes or, in extreme cases, the rifle may not fire when the trigger is pulled. If the rifle fails to fire when the trigger is pulled, it may fire when the bolt handle is subsequently lifted.
In rifles where this condition exists, it often resolves itself as the parts wear and the interference is reduced.

https://ruger.com/dataProcess/rprSafety/index.php?r=y

Shit happens - it gets fixed.