AI Gun (Artificial Insemination Gun) is designed for straw semen insemination for cow as a better replacement as Cassou equipment. This instrument is universal, and you can use it with French mini (0.25cc) and French medium (0.5cc) straws. It is made by stainless steel and with advanced spring lock on it. For putting sheath on equipment, there is no need to cut the sheath. Place sheath on equipment and just push to automatic lock. A very easy operation to fix a sheath on the equipment. To unlock the sheath after AI is done, push the spring liver and take the sheath off.