Mortar, 60mm U. S.-built, smooth-bore, muzzle-loaded, single-shot, high-angle of fire weapon, which weighs 45.2 pounds when assembled and fires an assortment of high explosive and pyrotechnic rounds; it has a maximum rate of fire of 30 rounds per minute and sustained rate of fire of 18 rounds per minute; the effective range is 2,000 meters. Mortar, 81mm U. S.-built, smooth-bore, muzzle-loaded, single-shot, high angle of fire weapon, which weighs approximately 115 pounds when assembled and fires an assortment of high explosive and pyrotechnic rounds; it has a sustained rate of fire of 2 rounds per minute and an effective range of 2,200-3,650 meters, depending upon the ammunition used. Mortar, 82mm Soviet-built, smooth-bore, muzzle-loaded, single-shot, high-angle of fire weapon which weighs approximately 123 pounds when assembled and fires high explosive and pyrotechnic rounds; it has a maximum rate of fire of 25 rounds per minute and a maximum range of 3,040 meters. Mortar, 120mm Soviet- or Chinese Communist-built, smooth-bore, drop or trigger fired, single-shot, high-angle of fire weapon, which weighs approximately 606 pounds when assembled and fires high explosive and pyrotechnic rounds; it has a maximum rate of fire of 15 rounds per minute and a maximum range of 5,700 meters. Mortar, 4.2 inch U. S.-built, 107mm, rifled, muzzle-loaded, M2 drop-fired weapon consisting of tube, baseplate and standard; weapon weighs 330 pounds, is 4 feet in length, and has a maximum range of 4,020 meters. Rate of fire is 20 rounds per minute and utilizes both high explosive and pyrotechnic ammunition. (Five M2s were employed at KSCB)