This Is Warzone's Best KG M40 Loadout
Developed in Sweden in the late 1930s, the KG M40 was a less-than-formidable light machine gun (per Military Factory). Although largely functional when the first models were assembled, the patent for the gun was eventually purchased by a German manufacturing company, Knorr-Bremse, which had little knowledge of gun-making. This resulted in the gun's ultimate failure. Thereafter, the gun was known to misfire and aiming became difficult thanks to loose shoulder stocks. Because of these issues, the gun became forgotten among World War 2 firearms.
But just because the real-world KG M40 was a failure, however, doesn't mean its "Call of Duty: Warzone" counterpart is. As far as light-machine guns in the game go, the KG M40 is near the top of its class. As noted by PCGamesN, the gun has the second-highest damage output per shot out of all assault rifles in the game. The gun's recoil might be a bit hard to control but, if you have all of the proper attachments, the KG M40 should work for you.
The best KG M40 loadout
As is the case with any loadout, when it comes to the KG M40's attachments, you are going to want to buff its weaknesses. Without any attachments, the gun is somewhat inaccurate, especially at range, and its recoil is nearly out of control. So the most obvious attachment you need is the Recoil Booster muzzle. For the Barrel, make sure to grab the Reisdorf 720mm Shrouded. According to Dexerto, this attachment improves accuracy by a substantial margin and also adds an increase in stability.
In addition, choose the G16 2.5x optic, the Krausnick 12V stock, the M1930 Strife Angled underbarrel, the 8mm Klauser 60 Round Drum, a Polymer Grip, and Lengthened ammunition. Many recommended loadouts follow a similar set-up, although CharlieINTEL recommends the Hatched Grip for dealing with recoil instead. The Loadout also recommends using a Mercury Silencer to muffle your shots, but this might make the recoil a bit more untenable.
You're going to have less mobility lugging around a giant light-machine gun, so for perks, it would be smart to grab E.O.D to up your defense and protect from enemy explosives. Overkill, which allows you to carry a second primary weapon, would also be a wise choice. Make sure you grab a SMG or shotgun in case you run into any close-quarters situations, just to back yourself up. The Amped perk will allow you to switch to that second weapon more quickly, so use that as well, just in case.