I hate to keep this thread off-topic, but the M240 is the primary infantry machine gun of the US military. I spent four years in the Marine Corps infantry either lugging that thing around or being in charge of someone who did. I can count on one hand the number of times we mounted ours on any kind of vehicle.
And as a side note, the M240 is not an LMG; trust me, there's nothing "light" about it. Despite what video games would have you believe, it's a medium machine gun, and a rather large and heavy one at that.
0331: "Accuracy by volume."