For those analyzing the shooters spent brass bring ejected, YES - very odd the brass appears to vanish in thin air. However, other anons have said the brass is going in the wrong direction. That isn't 100% correct. The rifle firing in the video is overgassed like many carbines. This causes the brass to bounce forward off the deflector. Many ARs show this as overgassing is simply a bandaid way to have guns cycle more reliability when dirty or using crap ammo. A heavier buffer or restricting the gas can fix that and would give you the rearward (to 4-5 o'clock) ejection