fWeaponConditionJamXX

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These GameSettings control the chance that your weapon will jam when you try to fire it. When a weapon jams, the animation for a reload jam will play and your gun will not fire. There are 10 game settings that control the chance for your weapon to jam based on its condition.

Note: There is a bug that impacts assault rifle class weapons related to jamming. It is explained below.


Setting Default Description
fWeaponConditionJam1 0 Chance of jam when weapon condition is between 0% and 10%.
fWeaponConditionJam2 0 Chance of jam when weapon condition is between 10% and 20%.
fWeaponConditionJam3 0 Chance of jam when weapon condition is between 20% and 30%.
fWeaponConditionJam4 0 Chance of jam when weapon condition is between 30% and 40%.
fWeaponConditionJam5 0 Chance of jam when weapon condition is between 40% and 50%.
fWeaponConditionJam6 0 Chance of jam when weapon condition is between 50% and 60%.
fWeaponConditionJam7 0 Chance of jam when weapon condition is between 60% and 70%.
fWeaponConditionJam8 0 Chance of jam when weapon condition is between 70% and 80%.
fWeaponConditionJam9 0 Chance of jam when weapon condition is between 80% and 90%.
fWeaponConditionJam10 0 Chance of jam when weapon condition is between 90% and 100%.


Behavior outside VATS mode

Non automatics

Each time you try to fire, there is a chance the gun will jam instead of firing. Non automatics includes things like the fatboy, missile launcher, pistols, sniper rifle, laser/plasma rifle, and etc.

Automatics

For automatic weapons, jamming works counter-intuitively. The chance to jam is checked only when the fire button is initially pressed. If the check passes, you can hold down the fire button indefinitely and your weapon will never jam, no matter how high the jam chance is set to. To be specific, the chance for a weapon to jam is checked only when the fire button is first pressed and not when each bullet is fired. I tested this with an assault rifle and the minigun. With a jam chance of .75%, simply hold down the fire button. The weapons will jam a lot at first, but once they start firing, you can continue to fire indefinitely without jamming, even if you reload, as long as you keep the fire button held down.

Jamming bug with automatic rifles

With an assault rifle, if you try to fire one bullet at a time by pressing and releasing the fire button, if the gun jams, your character will try to unjam the gun over and over again forever until you start holding down the fire button and the gun eventually fires. While the forced unjamming is going on, you can open your pip-boy in between attempts, however this is not recommended, as swapping to a melee or unarmed weapon will cause you to heavy attack indefinitely until you swap back to a ranged weapon, and swapping to a semi-automatic weapon will cause you to fire once when the weapon is drawn, and you'll be unable to fire again until you redraw or swap weapons.

Behavior inside VATS mode

Non automatic

Works the same as outside of VATS mode. Each shot made in VATS mode has a chance to jam. If your gun jams, you will try to unjam it until it fires. If you spend AP to fire two shots of your pistol, you normally will fire 2 shots. This is good.

Automatics

Fortunately, automatics work much better with jamming in VATS mode. Automatic assault rifles are fired in 3 round bursts. At the start of the burst, there is a chance to jam. Once the gun starts firing, it will fire 3 bullets successfully. Each burst has its own jam check. Like non automatics, if you spend AP to fire 3 bursts, you should* fire 3 shots. For the minigun, the jam check is also made when you start firing, and once the bullets fly they won't be interrupted. Like assault rifles, the minigun fires in bursts, and each burst has its own jamming check. This is also good.

Notes about jamming and VATS mode

It seems that there may be some kind of timeout period that will kick you out of VATS early, before you successfully complete all the shots you tried to execute. It may be related to the length of time spent in VATS (fVATSCameraMaxTime, which defaults to 20 seems to control this). With a jam chance of 1 (every shot will jam) a minigun will time out of VATS in 5ish shots while the 12mm pistol will time out in about 15 shots.

See Also