PREFATORY NOTE: This guide is a weapons and ammo chart for those with advanced knowledge of the game's fundamentals and weapons or those interested in the game's coding. It is NOT meant to be an introductory guide on using the weapons. If you want a more basic guide, read my Steam guides on the alien/marine/predator, or if you want a more in-depth guide on the usage of the marine weapons, you can also check out MandatoryAlcatraz's guide.

The following information was obtained by analyzing the game's default weapon and ammunition parameters through a Weapon and Ammo editor made by UberFoX (which is unreleased and will remain that way). The information contained herein will be of some value only to a few people who are fluent with the ins and outs of the game. This is not a detailed explanation of every aspect of every weapon. This guide assumes the reader has intermediate to advanced knowledge of the weapons already. Hopefully this guide is of some use to advanced users.

Here is the format of the main portion of the guide:

Primary Ammo ID: Name of primary ammunition
Secondary Ammo ID: Name of secondary ammunition if pertinent
Probability of Jamming: It is unknown what 32 means but it is the standard jamming rate
Firing Rate: Probably number per second for marine
Smart Target Speed: Speed at which the tracker can track an AI or NPC target
Gun Crosshair Speed: Unknown
Smart Target Radius: Radius of tracker crosshair
Flags: Special functions associated with weapon or ammo
Ammo Per Magazine: Amount of ammunition per magazine
Max Range: Weapon range, 0 most likely means undefined
Damage: Consists of six potential factors: Impact, Cutting, Penetrative, Fire, Electrical, and Acid. These most likely affect damage in varying degrees (i.e. 10 Electrical does more damage to an alien than 10 Fire).

Primary Ammo ID: 10MmCulw
Secondary Ammo ID: PulseGrenade
Probability of Jamming: 32
Firing Rate: 16.666
Flags: Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: 10MmCulw
Ammo Per Magazine: 99
Max Range: 0
Flags: None
Damage:

Secondary Ammo ID: PulseGrenade
Ammo Per Magazine: 5
Max Range: 5000
Flags: Explosive (Little)
Damage:

Primary Ammo ID: Smartgun
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 50
Smart Target Speed: 4
Gun Crosshair Speed: 160
Smart Target Radius: 55000
Flags: Is Smart Target, Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: Smartgun
Ammo Per Magazine: 500
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: Flamethrower
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 15
Flags: Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Fire Primary Late, Fire Secondary Late, Primary Muzzle Flash, Secondary Muzzle Flash

Primary Ammo ID: Flamethrower
Ammo Per Magazine: 100
Max Range: 500
Flags: None
Damage:

Primary Ammo ID: SadarTow
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: SadarTow
Ammo Per Magazine: 1
Max Range: 14000
Flags: Explosive (Sadar)
Damage:

Primary Ammo ID: Grenade
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Log Shots

Primary Ammo ID: Grenade
Ammo Per Magazine: 6
Max Range: 10000
Flags: Explosive (Sadar)
Damage:

Ammo ID: Fragmentation Grenade
Ammo Per Magazine: 6
Max Range: 0
Flags: Explosive (Little)
Damage:

Ammo ID: Proximity Grenade
Ammo Per Magazine: 6
Max Range: 5000
Flags: Explosive (Little)
Damage:

Primary Ammo ID: Minigun
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 100
Flags: Use State Movement, Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: Minigun
Ammo Per Magazine: 800
Max Range: 0
Flags: None
Damage:

NOTES: The minigun immobilizes the player for the duration of a "burst," which is qualified as a 25-bullet interval. Even if rate of fire is changed to 1, the player is still immobilized until 25 bullets in an interval have been fired. For more encumbrance information, see the encumbrance section.

Primary Ammo ID: Frisbee
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: Frisbee
Ammo Per Magazine: 1
Max Range: 14000
Flags: Explosive (Big No Collisions)
Damage:

Primary Ammo ID: MarinePistolPc
Secondary Ammo ID: MarinePistolPc
Probability of Jamming: 32
Firing Rate: 12
Flags: Secondary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID:
Ammo Per Magazine: 12
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: MarinePistolPc
Secondary Ammo ID: MarinePistolPc
Probability of Jamming: 32
Firing Rate: 12
Flags: Secondary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: MarinePistolPc
Ammo Per Magazine: 12
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: Cudgel
Secondary Ammo ID: Cudgel
Probability of Jamming: 0
Firing Rate: 1
Flags: Primary Is Automatic, Primary Is Melee Weapon, Secondary Is Rapid Fire, Secondary Is Automatic, Secondary Is MeleeWeapon, Fire When Cloaked

Primary Ammo ID: Cudgel
Ammo Per Magazine: 0
Max Range: 2500
Flags: None
Damage:

These weapons were never included in the final version of the game but exist in the game's coding nonetheless.

Primary Ammo ID: Shotgun
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Use State Movement, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash

Primary Ammo ID: Shotgun
Ammo Per Magazine: 20
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: Plasma
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Use State Movement, Fire When Cloaked, Primary Muzzle Flash, Secondary Muzzle Flash

Primary Ammo ID: Plasma
Ammo Per Magazine: 10
Max Range: 5000
Flags: None
Damage:

Primary Ammo ID: SonicPulse
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Secondary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: SonicPulse
Ammo Per Magazine: 100
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: ParticleBeam
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 16.666
Flags: Use State Movement, Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash

Primary Ammo ID: Beamcannon
Ammo Per Magazine: 100
Max Range: 0
Flags: None
Damage:

Primary Ammo ID: Smartgun
Secondary Ammo ID: PulseGrenade
Probability of Jamming: 32
Firing Rate: 33.333
Smart Target Speed: 4
Gun Crosshair Speed: 160
Smart Target Radius: 55000
Flags: Use State Movement, Is Smart Target, Primary Is Rapid Fire, Primary Is Automatic, Fire When Cloaked, Fire In Change Vision, Primary Muzzle Flash, Secondary Muzzle Flash

Primary Ammo ID: Smartgun (see above)
Secondary Ammo ID: PulseGrenade (see above)

Primary Ammo ID: PredWristblade
Secondary Ammo ID: HeavyPredWristblade
Probability of Jamming: 0
Firing Rate: 1
Flags: Primary Is Automatic, Primary Is Melee Weapon, Secondary Is Rapid Fire, Secondary Is Automatic, Secondary Is Melee Weapon, Fire When Cloaked

Primary Ammo ID: PredWristblade
Ammo Per Magazine: 0
Max Range: 2500
Flags: Slicing
Damage:

Secondary Ammo ID: HeavyPredWristblade
Ammo Per Magazine: 0
Max Range: 2500
Flags: Slicing
Damage:

Primary Ammo ID: PredRifle
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Gun Crosshair Speed: 640*
Flags: Primary Is Automatic, Log Accuracy, Log Shots,

Primary Ammo ID: PredRifle
Ammo Per Magazine: 20
Max Range: 0
Flags: Slicing X2, Produce Blood, Force Boom
Damage:

Primary Ammo ID: PredEnergyBolt
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Smart Target Speed: 0
Gun Crosshair Speed: 0
Smart Target Radius: 65000
Flags: Is Smart Target, Primary Is Rapid Fire, Primary Is Automatic, Secondary Is Rapid Fire, Secondary Is Automatic, Fire When Cloaked, Fire In Change Vision, Fire Primary Late, Fire Secondary Late, Log Accuracy, Log Shots

Primary Ammo ID: PredEnergyBolt
Ammo Per Magazine: 99
Max Range: 0
Flags: Produce Blood, Special
Damage:

Primary Ammo ID: None
Secondary Ammo ID: None
Probability of Jamming: 32
Firing Rate: 1
Flags: Fire In Change Vision, Fire Primary Late, Fire Secondary Late

Primary Ammo ID: PredPistol
Secondary Ammo ID: PredPistol
Probability of Jamming: 1
Firing Rate: 16
Flags: Secondary Is Rapid Fire, Secondary Is Automatic, Fire Secondary Late, Primary Muzzle Flash, Secondary Muzzle Flash, Log Accuracy, Log Shots

Primary Ammo ID: PredPistol
Ammo Per Magazine: 100
Max Range: 5000
Flags: Explosive (Pred Pistol), Produce Blood
Damage:

Primary Ammo ID: PredDisc
Secondary Ammo ID: None
Probability of Jamming: 0
Firing Rate: 1
Smart Target Speed: 4
Gun Crosshair Speed: 160
Smart Target Radius: 20000
Flags: Is Smart Target

Primary Ammo ID: PredDisc
Ammo Per Magazine: 1
Max Range: 1000
Flags: Slicing
Damage:

Primary Ammo ID: PredStaff
Secondary Ammo ID: None
Probability of Jamming: 0
Firing Rate: 1
Flags: Primary Is Rapid Fire, Primary Is Melee Weapon, Secondary Is Melee Weapon, Fire When Cloaked

Primary Ammo ID: PredStaff
Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing, Produce Blood
Damage:

* The speargun (predrifle) is the only predator weapon aside from the shoulder cannon that has a gun crosshair speed of 640. All others have a gun crosshair speed of 160.

Primary Ammo ID: AlienClaw
Secondary Ammo ID: AlienTail
Probability of Jamming: 0
Firing Rate: 1
Smart Target Speed: 0
Gun Crosshair Speed: 1500
Smart Target Radius: 55000
Flags: Is Smart Target, Primary Is Automatic, Primary Is Melee Weapon, Secondary Is Rapid Fire, Secondary Is Automatic, Secondary Is MeleeWeapon, Fire When Cloaked, Fire In Change Vision

Primary Ammo ID: AlienClaw
Ammo Per Magazine: 0
Max Range: 4000
Flags: Slicing
Damage:

Primary Ammo ID: AlienTail
Secondary Ammo ID: None
Probability of Jamming: 0
Firing Rate: 1
Smart Target Speed: 4
Gun Crosshair Speed: 160
Smart Target Radius: 0
Flags: Is Smart Target, Primary Is Melee Weapon, Secondary Is Rapid Fire, Secondary Is Automatic, Secondary Is MeleeWeapon, Fire When Cloaked, Fire In Change Vision

Primary Ammo ID: AlienTail
Ammo Per Magazine: 0
Max Range: 5000
Flags: Produce Blood
Damage:

Ammo Per Magazine: 1
Max Range: 5000
Flags: Slicing, Produce Blood
Damage:

Primary Ammo ID: AlienSpit
Secondary Ammo ID: None
Probability of Jamming: 1
Firing Rate: 1
Smart Target Speed: 4
Gun Crosshair Speed: 160
Smart Target Radius: 55000
Flags: Is Smart Target, Fire When Cloaked, Fire In Change Vision

Primary Ammo ID: AlienSpit
Ammo Per Magazine: 10
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 0
Max Range: 3000
Flags: None
Damage:

Ammo Per Magazine: 20
Max Range: 5000
Flags: Explosive (Little)
Damage:

Ammo Per Magazine: 1
Max Range: 10000
Flags: Explosive (Sadar)
Damage:

Ammo Per Magazine: 1
Max Range: 12000
Flags: Explosive (Little)
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Explosive (Little)
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing, Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing, Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing, Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Produce Blood
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: Slicing
Damage:

Ammo Per Magazine: 100
Max Range: 5000
Flags: Produce Blood
Damage:

Ammo Per Magazine: 99
Max Range: 0
Flags: Explosive (Plasma Caster), Produce Blood, Special
Damage:

Ammo Per Magazine: 99
Max Range: 2000
Flags: Explosive (Plasma Caster), Produce Blood, Special
Damage:

Ammo Per Magazine: 99
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 500
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 800
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 6
Max Range: 5000
Flags: Explosive (Molotov)
Damage:

Ammo Per Magazine: 0
Max Range: 0
Flags: None
Damage:

Ammo Per Magazine: 1
Max Range: 5000
Flags: Slicing, Produce Blood, Special
Damage:

Ammo Per Magazine: 1
Max Range: 5000
Flags: Slicing, Produce Blood, Special
Damage:

Ammo Per Magazine: 1
Max Range: 10000
Flags: Explosive (Sadar)
Damage:

Ammo Per Magazine: 5
Max Range: 5000
Flags: Explosive (Little)
Damage:

Encumbrance tables reflect species movement speed with any given weapon when not firing ("idle"), using primary fire, and using secondary fire.

The following pertains to all marine weapons with the exception of the minigun, which has a Movement Multiple and Jumping Multiple of 0 under Fire Primary.

The following pertains to all predator and alien weapons.

This guide was written solely by me (Olde). However, it would not have been possible without the tireless effort of UberFoX, who generously provided me with the tools to analyze and modify the game's weapon and ammo parameters. These tools will not be released. You can (and should!) use this guide and share it with others. However, you should not distribute it while giving authorial credit to either yourself, someone else, or to nobody at all. You may quote from it at length but please do not post the entirety as a guide on any other forum or site without my express permission. I also reserve the right to remove or modify this guide at any time and/or make it unavailable, with or without providing a reason.

Thanks for reading and enjoy playing!