Some of them get changed out to improve quality of the trigger pull, not due to any safety issues. Many are stock and a lot of those are modified by qualified gunsmiths, also to improve quality.Do they use the trigger system that's supposed to be defective?
Each M40 is built from a Remington 700 bolt-action rifle, and is modified by USMC armorers at Marine Corps Base Quantico, using components from a number of suppliers