Ten + years ago, I spent a lot of time and a few hundred $$ looking for a Lee Navy rifle in collectible condition.  Then one guy was reportedly killed when shooting one (firing pin blew out the back of the bolt & entered shooter's head) and I rapidly lost interest. 

Shortly after that, I read that the USMC came up with an in-service fix to remedy that problem. Apparently some rifles have the fix but most do not.  Fix is a wide external band on the outside of the rear of the bolt.  Does anyone know any of the USMC/USN details?