The XM806 Lightweight .50 Caliber Machine Gun is a prototype .50 caliber light machine gun. Developed by Armament and Technical products branch of the U.S.-based General Dynamics corporation to replace the M2 Browning heavy machine gun.
Spun off from the canceled XM312 in 2008, the XM806 was designed by General Dynamics' Armament and Technical (now known as Ordnance and Tactical) branch as a means to supplant the storied M2 Browning, who received a $9 million USD contract for it. Originally expected to be deployed at the end of fiscal 2012, delays caused deployment to be pushed back to 2013 and 2014, before being canceled altogether in June 2012; the Army would then use that money to upgrade their M2s to M2A1 specification.
While the XM806 was 49% lighter than the M2 and had 60% less recoil, the XM806 also had a rather low cyclic rate of 265 rounds per minute; in fact, it was so low that it was even lower than the M2 that it was supposed to replace. The XM806 also made a few ergonomic improvements to elements such as user safety and it was made easier to disassemble.