Ok so I know head shots are different for all the games, and may not carry over, but one thing that does carry over is recoil control. As a r6 player, I can tell you that going back to bf4 it felt like there was all most no recoil, and that was with the aek, and the sar 21 has the most controllable recoil in the game. Not trying to be elitist, but the sar 21 is nothing compared to say kapcan's gun (one of the lowest recoil guns in r6) that's why he's able to line up all those head shots.
