The M57 man-portable light field mortar 60mm is an infantry lightweight short-range mortar system in service in countries worldwide. The M57 mortar has a high rate of fire, long range for its category (up to 2,540m using HE shell M73), high portability, tight hit dispersion, and accuracy as well as high ammunition terminal efficiency. The system weighs only 19.7kg and consists of a smooth-bore barrel of 60mm, the adjustable bi-pod, mortar baseplate, with day optical aiming sight NSB-3, and other supporting equipment and accessories. The mortar is an easy-to-operate and highly reliable weapon and is ideal for effective autonomous infantry fire support, particularly for airborne troops, special operations, urban warfare, and rapid deployment forces. The mortar is a conventional drop-fired system with a fixed firing pin. The bipod has a cross-leveling gear operated by a threaded sleeve between one leg and the elevating gear. The M57 field mortar can fire a variety of 60mm mortar shells, standard HE shells, as well as Smoke, visible, and IR illuminating shells including target practice rounds. The M57 mortar is able to effectively destroy various modern small battlefield targets (light shelters, trenches, pick-ups, jeeps, trucks, wiring obstacles, sand-bag protected MG posts, etc.) at all ranges up to 2,540m and can be fired from all kinds of terrain as well as from a vehicle.