The German-Swiss Solothurn S-18/100 was a World War II produced, 20mm Anti-Tank Rifle. First developed by Swiss sources in 1934, it would be adopted by The German Army in 1940. The weapon was fired from a fixed, reinforced position, by a single shooter. Semi-automatic, The S-18 could fire (10) rounds, at roughly 3 per minute (sustained fire). Weighing 100-lbs. The S-18s round (20mm) could penetrate up to 1.5-inches of Enemy Armor, up to 75-yards. Most of Nazi Germany's Allies used The S-18 in their inventories. The S-18 was not seen in use much after 1943, owing to new directions in The German War Effort.