From Halopedia, the Halo Wiki

A Machine Gun is a fully automatic weapon usually, but not always, fired from a stationary position.

They usually are always fully automatic, and use rifle-caliber rounds, and sometimes even larger rounds. If the round exceeds 15mm in diameter, it is usually classified as an "auto-cannon". "Machine Gun" may refer to the following:

• AIE-486H Heavy Machine Gun- The new machine gun to replace the M247 GP in Halo 3.

• M41 LAAG- The Warthog mounted machine gun.

• M247 GP Machine Gun- The stationary platform found in Halo 2.

• M202 XP Machine Gun- A less advanced gun decommissioned and used for training exercises.

• "Confetti Maker"- A .30-caliber handheld machine-gun used by the United Rebel Front.

• HMG-38- A older weapon that was obsolete by 2525 but is found on the Black Market.

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