High Quality Content by WIKIPEDIA articles! The LSAT light machine gun, of the LSAT (Lightweight Small Arms Technologies) program, is a developmental light machine gun. The program was initiated in 2004, when the Joint Service Small Arms Program (JSSAP) challenged the American defence industry to develop lighter small arms and ammunition. The LMG provides a major reduction in weight over legacy weapons, as well as improvements in other areas, such as controllability and reliability. As of 2008, it has two configurations, one that fires polymer-cased ammunition, and one that fires caseless ammunition. After further research and development into both technologies and the platforms that fire them, one of the two variants shall be chosen for production.