We can’t speak for his accuracy, but this man is handling a lot of serious firepower. Shooting just one Barrett M82/M107 is impressive enough, but two at the same time? His arms are going to be sore later. To put things in perspective, the M82 fires a .50 BMG round (something which was originally designed to shoot down aircraft) at a muzzle velocity of roughly 850 m/s. When it comes to muzzle energy, the .50 BMG produces from 10,000 to 15,000 foot pounds, which is comparable to about six times that of a .30-06 Springfield round.
Now imagine that kind of power in both hands, and you’ll be more impressed in how this shooter didn’t go flying backwards.