As many times as I've seen them perform, live and on video, I never noticed the grip on the stock was shaved down.
Seems to me that the stock would be weakened at this point. I myself was on a ROTC drill team and used M14s and later used 1903s.
We used to toss the M14s around and spin them with no problem. We also used a tight sling but the Marines use a looser sling. Maybe they find the stock and sling set up handles better. In any event watching them brings back memories of my team and all those racks of M14s in our armory.

Seems to me that the stock would be weakened at this point. I myself was on a ROTC drill team and used M14s and later used 1903s.
We used to toss the M14s around and spin them with no problem. We also used a tight sling but the Marines use a looser sling. Maybe they find the stock and sling set up handles better. In any event watching them brings back memories of my team and all those racks of M14s in our armory.
