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[WOTC] Iridar's Underbarrel Attachments
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46.118 MB
Oct 15, 2018 @ 9:48am
Jun 29 @ 9:14pm
36 Change Notes ( view )
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[WOTC] Iridar's Underbarrel Attachments

Mod adds:
  • Three tiers of Underbarrel Shotguns (UBS).
  • Three tiers of Underbarrel Grenade Launchers (UBGL).
  • Three tiers of Underbarrel Flamethrowers (flamethrowers look the same at all tiers).
  • Extra items that can be equipped in Utility Item or Secondary Weapon slot that provide additional ammo for these attachments.
All of these items can be built in Engineering.

Underbarrel Attachments function like additional weapons, with their own stats and abilities. By default they can be attached only to Assault Rifles, but you can configure the mod to make UB attachments available to any weapon.

This mod also makes Rifles available to Grenadiers to make it possible to build a soldier around using an Underbarrel Grenade Launcher. Additionally, the Open Class Weapon Restrictions mod is used to provide access to mentioned extra items that provide reloads for UB attachments.

Perform research.
  • Conventional UBS and UBGL: Modular Weapons -> Underbarrel Weapons (new research)
  • Conventional Flamethrower: Purifier Autopsy
  • Magnetic UBS and Flamethrower: Magnetic Weapons
  • Magnetic UBGL: Muton Autopsy
  • Beam UBS and Flamethrower: Plasma Rifle
  • Beam UBGL: Advanced Grenades (Proving Grounds project)
Then you can build Underbarrel Attachments in Engineering one at a time for a modest cost in resources appropriate for each tier.

Additionally, purchasing Squad Upgrades for normal primary weapon Shotguns and secondary weapon Grenade Launchers will automatically upgrade not equipped Underbarrel Attachments to the next tier. In other words, when you tell Shen to upgrade shotguns, and she sees some spare Underbarrel Shotguns lying around in Engineering, she will upgrade them too while she's at it.


All Underbarrel Attachments are mutually exclusive with Bayonets, and they add a -10 Aim penalty to Reaction Shots, and -1 penalty to Mobility. Configurable.

Underbarrel Grenade Launcher does not allow you to launch standard grenades. It uses its own "ammunition".

By default Underbarrel Shotgun has three shots, and Underbarrel Grenade Launcher has one shot. You can build additional items that will provide extra reloads for both attachments.

Underbarrel Shotgun shots can Headshot the Lost and will respect abilities such as Light 'Em Up or Marauder.

By default, firing the Underbarrel Grenade Launcher is a turn ending action, while reloading it is a non-turn ending action. Both will respect Salvo and Total Combat.

Utility Items that offer extra reloads for UBGL count as "grenades" and should be compatible with all perks that increase grenades' carrying capacity, such as Heavy Ordnance. Perks that provide bonus damage and effects to grenades are more tricky, and will likely require me to add additional support. Right now it is confirmed compatible with Biggest Booms and Volatile Mix.

Underbarrel Flamethrower has 2 shots per mission. Carrying a special Utility Item provides two more charges. No reload is required.


Almost every aspect of this mod is configurable. Check the XComUnderbarrel.ini file for instructions and examples. You even get to fine-tune the attachments' position on the weapon model, though it would require a lot of .ini editing.

It is also highly recommended that you get my Weapon Skin Replacer mod, as that will enable a cruch that improves attachment positioning for certain Attachment / Rifle combinations.

Beam Grenade Launcher can be configured to use the same targeting logic as Blaster Launcher, though if you use that, you will probably want to add an Elerium Core cost to them.


Incompatible with Customizable Secondary Weapons. Using it for some reason makes UB attachments not appear on weapons.

Integration with Grimy's Loot Mod is out of the question.



Credit to Aks for Russian translation.
Underbarrel Weapons research image and inventory icons by NeIVIeSiS.
Huge thanks to Community Highlander team for adding the necessary functionality at my request. Thanks to CX as a whole for a warm place to call home. Thanks to Spart for teaching me his kitbashing ways and for his sawedoff shotgun model. Credit to InternetExploder whose Beam Grenade Launcher was used as base for Beam Underbarrel Grenade Launcher.

Please support me on Patreon[www.patreon.com] if you require tech support, have a suggestion for a feature, or simply wish to help me create more awesome mods.
Popular Discussions View All (4)
Oct 4, 2021 @ 6:30am
Russian Translation
Mar 27, 2020 @ 11:12pm
Iridar's Underbarrel Attachments Chinese Translation
Aug 20 @ 11:46pm
New attachments types
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batman_is_St0pid Jul 8 @ 9:45am 
never mind i just checked resistance firearms page it is compatible
batman_is_St0pid Jul 8 @ 9:43am 
does resistance firearms work with this mod
Iridar  [author] Jun 29 @ 9:14pm 
The three abilities are:

There's no "FF_" prefix.

You're right, it doesn't work. Looks like it never did. Shameful of me not to test that, but it is a pretty old mod and I barely knew what I was doing. Fix uploaded.
tac Jun 29 @ 6:47pm 
I'm running this mod with your grenade scatter one. Currently, the grenades from this mod's underbarrel launcher isn't getting any scatter. I tried adding the ability tied to launching the underbarrel grenades (FF_Fire_UBGL_Conv, for example) into the appropriate ini, but it's still not working. Is there any advice you can give?
MrMister Jun 29 @ 9:37am 
Hey Iridar, some testing reveals that UBGLs are failing to benefit from Volatile Mix's +2dmg, despite your documentation saying you've manually adjusted for it to work, and all the scripts to that effect that I've found within the mod.

I've tested it just loading only this mod + reqs (and Skirmish+ to make it faster), ini purge and all, and while the damage preview does show the +2dmg, it fails to inflict it on enemies.

I understand not wanting to touch an old mod, but could you confirm whether it works for you or not? I want to make sure it's something else wrong on my end.
Frosted Vert Apr 22 @ 9:12am 
Phew, sorry trying to keep track of everything is wild
Iridar  [author] Apr 22 @ 5:59am 
Pretty sure it's part of Mod Jam
Frosted Vert Apr 22 @ 5:16am 
Could it get a second glance for LWotC?
Mosesjns Apr 6 @ 8:26pm 
Love this mod concept thank you creator!
Carlton BEaEnkEs, no E Feb 3 @ 7:05pm 
Alright, well thank you for responding, in any case. Love a lot of your mods, mate. Keep up the good work.