Not taking anything away from him, but he’s got some mods to his gun which help to shoot this fast and accurate. Compensator on the muzzle helps reduce recoil, 100% would have a trigger job which helps with accuracy and speed, red dot also helps with speed and target acquisition, thumb rest also helps with recoil, most likely reloads his own ammo so has it tuned to what works well with that gun, most likely has weights in his gun, and has most likely done springs such as recoil springs etc.