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Season Four ofDelta Force, titled Eclipse Vigil, introduced a bevy of new content, including the K437 assault rifle. Fast-firing, hard-hitting, and firing the .300 Blackout round, it’s a powerhouse of a weapon that’s well worth investing in. The best builds for the gun will depend on which game mode you’re playing and, in Operations, your budget.
Today, we’ll be covering three of the best builds you can use for the K437 — one all-around option to use in Warfare, as well as a budget kit and an expensive setup for Operations.

Best Budget K437 Operations Build
We’re starting with the Operations builds for the K437 because the main way to get the gun is by engaging with Delta Force’s extraction mode. It’s completelylocked in Warfareuntil youfind it in Operationsandsuccessfullyextract with it.
You’ll alsobe able to purchase it from the Auction Housesome timeafter the season launch. At that point, you’ll have access to it in both modes.

Thebudget buildwe’re going with for the K437costs about 90,000 Tekniq Alloy credits in addition to the cost of the weaponitself. No breaking the bank here. The main sacrifice you’ll make is in the weapon’s recoil, but it handles well enough with the following setup:
One of the best cheap stocks offering solid buffs to Control and Stability without sacrificing too much ADS time from Handling debuffs.

A small but free buff to both Control and Stability that won’t break the bank.
One of the cheapest Foregrips still yields a slight buff to Control.

This setup does requireyou to work a bit harder to control the K437’s recoil, and the bullet spread is significant enough that anything outside of medium range is out of the question.
That said, if youmaneuver the map correctly and attempt to place yourself in advantageous positionswhenever possible, you’ll do fine.
You can, of course, also upgrade any of these parts for an additional cost, but remember thatthe high-tier purple attachments almost all come with some drawbacks. Your weapon price can skyrocket if you add other attachments to offset them.
Best Premium K437 Operations Build
The premium (read:expensive) K437 loadout has two goals: toturn the weapon into a laserbeam andminimize the Handling debuffs.
We’ll bespending around an additional 240,000 Tekniq Alloyto get there, and if you add on other expensive parts beyond our recommendation, the price jumps even more.
One of our main ways to offset the Handling costs of other attachments.
We chose this grip not only for the small but welcome buffs, but also the ability to add a Grip Mount.
As good as the other Grip Mount is, it costs a bit too much Handling for our liking, and this one has no major drawbacks.
Besides looking cool, the Angled Grip offers fantastic Control and Accuracy buffs without costing too much in other areas.
We’re foregoing a suppressor as you’ll likely have a quiet Sidearm for dealing with the AI enemies, and the Control buff here is just too good.
Lasers are a great way to make up for having Handling debuffs, though you’ll need to be careful when you use it, as anyone with eyes can see you coming.
With a premium K437, you want as much range as you may get, as the thing isincrediblyeasy to control. We’ve also offset this attachment’s Accuracy debuff with others in the setup.
Another cheap attachment for a bit of additional free Control.
In our testing, this setup,although expensive, makes the K437 an absolute beast,regardless of where you use it. If you want even more flexibility, you can trade out the simple red dot for a scope and canted sight.
Beware thatyou’ll lose a lot of the Handling we’ve baked into the build, but it does give the weapon even more ways to dominate.
Best Warfare K437 Build
TheK437 build we recommend for Warfare is very similar to the premium setupyou’d equip inOperations, with a few key differences. We’ve added a higher-capacity magazine and changed both the Stock and Foregrip.
Our reasoning here is mainly aroundammo economy and finding a better balance with Handling. Ammo is much less of a factor in Warfare, and accuracy at distance is just as useful as having snappy ADS time.
The bonus to Handling here is important for adding a larger mag, which will tank that stat.
We’ve already lost most of the Handling bonus from the Stock, but the extra rounds will help you win fights against multiple opponents.
The massive Control buffs from this attachment outweigh its cutting Handling even further.
With this setup,the K437 isslightlymore difficult to control, but not enough to significantly impact its overall performance. The extra Handling makes up-close fights a bit more manageable, while also giving you more freedom to put bullets downrange at the enemy.
Where To Find The K437 In Delta Force
As we said earlier,the only way to get your hands on the K437 is by extracting with it in the Operations mode.You can alsopurchase it from the Auction Housewhenever it becomes available. You’llonly find K437s in the Weapon Cratesscattered through the Operations maps. The easiest ones to check are the two at the uppermost platform in thecenter of the Cement Plant on Zero Dam.
you’re able to also check the Weapon Crate on theshipping containers in northern Zero Dam. If you manage to reach all of these crates in one raid, you’ll have three chances at getting the K437.
The K437 has a chance to drop on both Easy and Normal Zero Dam, though your chances are pretty low. In our hunt for the weapon, we saw more shotguns and other low-value guns on both difficulties.