Weapon Jamming Tested and Explained

If you don't feel like reading, you can watch this 3 minute video where I explain what I found.


Recently, I took it upon myself to test the new jamming feature, introduced in the new 12.11 patch.

  • I conducted 25 tests in Offline Factory.
  • Most tests I fired 1278 MAI AP rounds, rounds we're sourced via flea market.
  • I fired a total of 31,572 rounds over the course of 25 offline raids.
  • I used an MK-47 'Mutant' for the test. With the highest Durability Burning suppressor I could buy (SDN something). Total durability burn of the weapon was 144%.

The weapon started at 99.5 durability and never went below 18.3 durability. This is because I could not carry enough rounds into a raid to fully test it, however, I think its safe to assume the jam chance increases exponentially based on the data I collected.

All tests we're done using fully auto. Sorry I'm not a masochist, however in online play I have had multiple jams with Semi-Auto weapons, so if you we're to ask me, I would bet on it having no effect.

To test, I would fire my weapon, and log the durability of the weapon at the time of the jam.

You can find all data here.https://docs.google.com/document/d/1tLrBHlCo0CuPdbHtsVU7ni8Yf2PChISUDiv66SCFHOM/edit?usp=sharing

(Yes I realize I fucked up the name of the graph, I was half asleep.)

As far as I can tell, Weapon jamming is completely RNG until the weapon hits 50% durability, in which case the chance of a jam will continuously increase as it gets closer to 0% durability. So its a completely RNG based system.

So the game does not see a difference in a 100% durability weapon vs. a 50.1% durability weapon, in regards to weapon jamming. Long to mid range accuracy however, is still affected.

I tested different magazines and saw no difference in the data. I used a mix of 75 rounders, 40 rounders, and 30 rounders. Zero Difference.

I also tested PS 7.62, but did not include it in the data, I got a lot of jams with those rounds at higher durability's , but I would assume that's because the durability burn is less and I could fire more rounds without killing the gun.

The average percentage chance for weapon jams was 0.005%, but keep in mind, this average includes a HUGE variety of weapon durability statistics and will vary wildly depending on the durability and durability burn of the weapon and ammo. The average is not a concrete number, most people's chance to jam will be VERY different, and it changes every time the Weapons durability changes.

A few things to note.

  • Jammed bullets do not reduce durability when fired, as they do not actually fire.
  • There is no reason to believe that Scav Karma effects weapon jams, this theory is based on rumors from many years ago, and I haven't seen any evidence suggesting this is true. I also didn't bother testing as I don't really care and have a strong suspicion it will be a waste of my time.
  • Point fire accuracy starts to decrease upon hitting 50% durability. Although this would need further testing to further understand.
  • If you are using a close range weapon, and don't care about long to mid range accuracy, don't bother wasting your money repairing your weapons above 50% durability to reduce the chance of a jam. Its pointless.

Source: https://www.reddit.com/r/EscapefromTarkov/comments/okftv4/weapon_jamming_tested_and_explained/

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