BTW, the M40 the Marines used until very recently, was a production Remington 700, that was then gone over with a fine tooth comb by the best armorers at Quantico. That's not a huge operation. Maybe a bit more than three guys, but it ain't over six that get their hands on those rifles.
We fought with those from Vietnam to Iraq. I had a friend (now deceased) that had sixteen confirmed kills with his.