The Projector, Infantry, Anti-Tank, or PIAT was an anti-tank weapon used by British and Commonwealth forces during World War II. The weapon was not a rocket launcher, though it is sometimes mislabeled as such. The weapon worked by using a powerful spring mechanism to activate a precussion charge on the back of the projectile, launching it towards its target. The PIAT fired a 2.5 pound explosive shell with a hollow charge designed to pierce the armor of tanks, though this was only really effective against the side and rear armor of German heavy tanks such as the Panther and Tiger. The weapon was, however, known to be difficult to operate and having a kick that could bruise the user. The PIAT later saw use in the first Arab-Israeli War and the Korean War, before being replaced by a superior anti-tank weapons such as the Bazooka rocket launcher and Carl Gustav Recoilless Rifle in the 1950s.