How do you suppress an enemy exactly?

[Lymark]

Yes, I know that you could pin an enemy down by shooting at him while he's in cover(suppressing debuff). But I noticed the debuff only happens occasionally. Many times I fire at them for like 2~300 rounds, but I just can't get him pinned, sometimes it doesn't work at all even he's in a cover.

Is this a bug or something? Otherwise, LMG is quite useless.

[McDavidson]

There are some that suggest a (x) amount of damage.
Others say how much "Threat" your weapon has.

[Warfarematt]

Threat has a pretty good impact on suppressing enemies

[GSPOTxJESUS]

Machine guns have a good amount of threat, so it would be more likely to pin an NPC with it rather than a suppressed weapon that reduces threat.

[Cryme Tyme]

AK74 with increase threat muzzle, my parkan(gold named Ak) supress DZ mobs in 1 burst.

[SwashBuccaneer]

No idea but at times it feels like my pistol supresses faster than my LMG with an aggro muzzle LOL. I have +18% threat on both weapons.