Near the end of the vids there is a shot analysis which says it all.
If the shooter would have used a raised cheek piece or Spuhr stock on the PTR I think the hit ratio would even be higher.
Enjoy.
PTR91FR: https://www.youtube.com/watch?v=aFlcLCnr0XQ
SCAR 17: https://www.youtube.com/watch?v=lFRIuENHvQI
Knights M110: https://www.youtube.com/watch?v=OI1vkTdlfe8
M14/M21: https://www.youtube.com/watch?v=nB9S8aVrCHk
