The MG55 is a Special Forces medium machine gun with very low recoil. It unlocks free at 60% of Horde Killer and goes in the special slot. It is the best machine gun for taking a Horde apart.
Keep clearing Hordes. It appears in your weapon locker under special weapons at 60%, with the bigger belt at 85%.
Low recoil keeps a long stream of fire on the Horde's front line. Pair it with Napalm Molotovs and traps at a chokepoint. It also mows down human camps.
It beats the MG45 and RPD on control and capacity. The .50 BFG competes for the same slot, so swap based on the job.
Auto Shotgun
The Auto Shotgun is a Special Forces drum-fed shotgun you get free from the Horde Killer storyline. It fires shells as fast as you pull the trigger. It is one of the best close-range tools for Freaker crowds and Breakers.
IDF Pup
The IDF Pup is a Special Forces bullpup rifle you get free for clearing Hordes. It unlocks at 50% of Horde Killer with a 45-round magazine. It is accurate, fast and one of the best primaries for Horde fights.
SMP9
The SMP9 is an automatic sidearm with a 30-round magazine. You can buy it at Hot Springs or Lost Lake, or get a better Mil-Spec copy free from Horde Killer. Full-auto in the sidearm slot is great on the bike.