The M-60 series general purpose machine gun is a light weight, belt fed, gas operated, air cooled weapon with fixed headspace and timing to allow for the rapid exchange of barrels during sustained firing situations. The M-60 can be carried and operated by one individual, though it is common practice to assign the weapon to a fire team (gunner and assistant gunner, who carries an additional barrel and ammunition). The M-60 is equipped with an integral bipod assembly which can be used to stabilize the weapon during offensive operations. Optionally, the M-60 can be set up on a tripod for increased stability and long range accuracy. In addition to the basic M-60 there are two variant models; the M-60 C/D (for use on helicopters) and the M-60E3, a lighter version of the basic model used by the Marine Corps and U.S. Special Operations Forces.