I served in the Army, but was never been in combat, so perhaps I shouldn't comment, but the whole thing seems unreal to me. When the rifle fails, he completely forgets about cover and concealment and concentrates on working the rifle. With bullets flying around, I think I (being a coward) would worry about preserving my hide while correcting rifle problems. It looks more like some kind of "See what junk rifles soldiers have to use" propaganda video than actual combat footage.
As for the camera setup, again this is not my army, but I find it hard to believe that a soldier sets up a camera (or a cameraman sits with his back to the enemy) to record events just in case the soldier happens to have problems with his rifle/ammunition/magazines. Then his hat keeps falling off when he fires. I would dump the hat which, (unlike a helmet) gives no protection at all, and concentrate on aiming at the bad guys.