A machine gun, or MG, is a high-capacity weapon fed from a belt or magazine. Machine guns have appeared in all games thus far.
The first game MGs appear in; only one is available for use.
- Machine Gun - This generically-named weapon features the highest capacity of all non-Nanotech style weapons, with high damage and a decent rate of fire.
The second game MGs appear in, with more available for use by the player.
- The Hellfire Limited - A beefed-up version of the Hellfire with a gold body, higher capacity and higher damage.
- The Hellfire - Appearing as a six-barreled minigun, the Hellfire is useful for providing suppressive fire towards zombies.
- Mortara M75 - One of the most recurring guns in the entire series, the M75 combines the power of The Dominator and the magazine capacity of the .30 Light Machine Gun.
- .30 Light Machine Gun - Firing a full power 7.62 (.30 caliber) cartridge, this LMG is a decently powered weapon that can provide suppressive fire.
The third game in which MGs appear in, with only two available to the player.
- Hellfire - A huge step up from the version in Zombies, this version of the weapon is highly overpowered, with high damage and an infinite ammo pool.
- Mortara M75 - As with Zombies, the Mortara is back, except that it has to be built from scratch by winning multiple tournaments.
- The Hellfire (unusable) - The same gun as with Zombies, except that it is now an NPC only weapon.
The fourth game in which the MGs appear, the weapons now are shot in 3rd person.
- .30 Light Machine Gun - As with the prequel, the LMG is still the weakest machine gun, but its price has been halved.
- Mortara M75 - Once again, returning from the prequel, the Mortara is now given a huge price increase, making it the most powerful MG in the game.
The fifth game where MGs appear, the weapons now have infinite ammo. To compensate for this, the weapons now overheat after a certain amount of time. They are now called Heavy Guns.
- Mortara Elite - A version of the Mortara M75; except that the Mortara Elite is now the weakest MG in the game.
- R&P-9 LMG - An oddly-fed machine gun using what looks like a side mounted STANAG drum magazine, the R&K is a decent weapon for the price.
- R&P Elite - A buffed-up version of the R&P-9 with a unique camo pattern and better damage.
- Volcano - A re-skinned version of the R&P Elite; it performs the same as the former.
- XO Grinder - A powerful futuristic-styled MG, it is one of the more powerful MGs available.
- Grinder Elite - A beefed-up version of the XO Grinder with higher damage and a unique camo pattern.
- Leech (removed) - A beefed-up version of the ACR Elite with a different color and higher damage.
- Reaper (removed) - A very powerful MG with a distinctive carrying handle, the Reaper is a formidable weapon for suppressive fire roles.
- Reaper Elite (removed) - A beefed-up version of the Plague with a different color scheme and higher damage.
- ACR Elite (removed) - A beefed-up version of the ACR 88 with a different color and higher damage.
- Deck the Hells (removed) - A beefed-up, highly overpowered version of the Hellfire Tiger with christmas lights adorning the weapon, much higher damage and a longer overheat time.
- Elf Eraser (removed) - A re-skinned Christmas-themed version of the Reaper with Christmas lights adorning it; it performs the same as the Reaper.
- Plague - A beefed-up version of the Reaper with an ooze pattern and higher damage.
- Sledgehammer - An extremely powerful drum-fed machine gun which is hard to earn.
- Bec De Corbin - A beefed-up version of the Sledgehammer with a different color scheme and higher damage.
- Hornet - A re-skinned promotional version of the ACR Elite; it performs the same as the former.
- Hellfire Tiger - A futuristic five-barrelled machine gun, boasting the highest rate of fire of any gun in the game.
- ACR 88 - A bullpup machine gun with a huge magazine, it is decently powered.
- The Hellfire (unusable) - This weapon is wielded by Juggernauts and certain bosses.