Armbrust 300

The Armbrust 300 (German: Crossbow) is a lightweight unguided anti-tank weapon designed and developed by Messerschmitt-Bölkow-Blohm of Germany, who later sold its manufacturing rights to Chartered Industries of Singapore (the predecessor of ST Kinetics).

The Armbrust is a recoilless weapon, and is one of the few weapons of this kind that may safely be fired in an enclosed space. The propellant charge is placed between two pistons with the projectile in front of one and a mass of shredded plastic in the rear. Unlike most recoilless weapons, it is a true counter-shot weapon, as the mass of the projectile is equal to the mass of the counterweight and they are ejected from the barrel at the same initial velocity. When the weapon is fired, the propellant expands, pushing the two pistons out. The projectile is forced out of the front and the plastic out of the back. The plastic disperses on leaving the back of the barrel, and is quickly stopped by air resistance. The pistons jam at either end of the barrel, locking the hot gases inside. Its warhead can penetrate up to 300 mm of armored steel.