The M13 link, formally Link, M13, is the U.S. military designation for a disintegrating metallic link specifically designed for belt-fed firearms and rounds; it was introduced in the mid-20th century. It is the primary link type for the U.S., and among NATO for 7.62 mm ammunition. It has been in use for over 50 years as of 2007 and is used on the Dillon M134D Minigun, M60 Machine Gun, FN MAG, AA-52, HK21, and the MG3, among others. In West German service the link received the designation DM-13. Some other countries also redesignated it when it was adopted.