This has been done years ago, it does however prove that an AK can be reliable in almost any situation. It has always been perfectly safe to shoot one without the top dust cover, it’s just sheet metal that keeps dirt out.
Yeah, but the recoil spring and its guide rods keep the bolt carrier from coming back far enough to jump the rails. If you’re sure you’ve got enough rubber band tension to do that, then have at it I guess. I’ll pass.