[JamesP81]

You'll see the spent cartridge

The cartridge is too far in front of the ejection port. M4 carbeines tend to throw brass backwards, at least the ones I've shot do.

As has been mentioned, however, the gun doesn't have a magazine in it. It's fake. The gun in the picture is unloaded.

[jonascord]

I disagree.

The magazine is there, it's just a close color match to the guy's shirt behind the shooter, since the anodizing tends to fade over time from wear. The sling is attached to the front sight extension, rather than the front swivel. See how it's bunched up? The gun also has a vertical front grip on the fore stock, which accounts for the weird angle of the shooter's left hand. There is a wedge shaped deflecting block just behind the ejection port on the A4 model, so left hand shooters would not catch hot brass in the face. As rifles are worn in from firing, the angle of ejection tends to shift.

Note also how the kid on the far left is cringing from the muzzle blast. I can attest that it hurts like hell.