The RT-20 is a Croatian anti-materiel sniper rifle developed by Metallic in Rijeka in the mid-1990s and marketed by RH-Alan. It was developed to shoot the thermal sights on Serbian M-84 and T-72 tanks. The name itself is actually an acronym of the Croatian word Ručni Top 20, or "Hand Cannon 20mm". Operating with a bolt action, it houses a single 20mm round and must be reloaded after each shot. Given its large caliber, it is one of the most powerful anti-materiel rifles currently in use by any country and is comparable to the South African Denel NTW-20 and the Indian Vidhwansak, with the difference being that the RT-20 is recoilless.