This is the Mark-II Anti Tank Rocket Launcher (5cm). This particular weapon was a refinement on the older Mark-I, which was little more than a steel pipe with a fuse containing a shaped charge on a crude rocket. While functional and fairly easy to use, the Mark-I's effective range was limited to 30 meters, it was a one shot weapon, sometimes burned the hands of the user and if they were jostled around enough the rocket would sometimes get stuck during firing and would blow up the user. Despite the objections of some engineers that the Mark-I could be refined, the Mark-II was a new weapon from the ground up. Fully reusable, the Mark-II could penetrate up to 175mm of armor (200% that of the Mark-I) and had an effective range of 150 to 200 meters. It has electric ignition. Aiming was done via a side mounted sight. A steel plate was put in front to protect the user from blastback. While large and somewhat cumbersome, the Mark-II was much preferred by the soldiers who used it and generally was better on the battlefield than the Mark-I, especially among specialized tank hunters.