The XM307, in development with General Dynamics, is a lightweight, two-man portable machine gun that fires precision airbursting munitions. It is equipped with a target acquisition fire control sight and is the first automatic weapon to fire a 25mm thermobaric round at the intended range of 450 meters. Compared to the MK19 40mm grenade launcher that fires its rounds in a high arc, the XM307 fires on a flatter trajectory, boosting their velocity and letting Soldiers put three rounds on a target at 1,200 meters in the same time it takes the MK19 to send just one