Push-pull guns typically have fewer wire-feeding issues than general purpose MIG (metal inert gas) guns when used with aluminum wire, cored wire, and other soft electrode wires. They also can weld for longer durations than spool guns. They are suitable for production welding tasks and can be used farther away from the welder than other styles of MIG guns. A pull motor in each gun works with a push motor in a compatible wire feeder to minimize resistance as the wire feeds through the gun liner and into the gun. These guns connect to a MIG welder to deliver current to the wire and create an arc between the wire and a metal workpiece. The heat from the arc melts and fuses the workpiece material and the wire material to create a weld. MIG guns let welding operators control the position of the wire during welding tasks. Guns that are used in gas-shielded MIG welding also supply shielding gas to keep airborne contaminants out of the weld pool.