Watch his hands very closely as he "drops" the rifle. He doesn't so much drop it as gingerly set it down. Then notice how long it takes him to pick his left hand up from the rifle after he sets it down....
Now imagine the sequence of events in reverse.
He starts with his hands on his face, back to the camera.
Squats down facing the camera and rifle with right arm across face while getting left hand on forend of rifle.
Starts picking up rifle with left hand and cups it in crook of right arm as he stands up.
Brings rifle butt up to his face (which is turned sideways) and thrusts arms outward quickly while pivoting face towards "target" area (never did see a target)
Holds arms & rifle extended in front of body for a second.
Lowers rifle butt to waist and does that silly hopping thing.
Then, he and his cameraman buddy play the video in reverse and upload it to the interwebs.
Never did see the bolt cycle or casing eject when he "fired" the rifle...
Fake.