- The Underbarrel Weapons themselves, plus the secondary versions of their ammo items, now have infiltration costs. The utility versions use the default utility item cost and didn't need to be set up separately.

- Conventional underbarrels can now be built for free in Engineering one at a time, just like the ammo items themselves. Both need the Underbarrel Weapons research itself to be finished first. I made this change as conventionals become obsolete very fast in LWOTC, and the underbarrels themselves have drawbacks (besides slowing down infiltration, they also apply a -1 mobility penalty and -10 reaction fire aim penalty to the soldier).

- Costs and requirements have been adjusted for Magnetic and Beam tiers as well. They are cheaper than before. Underbarrel Shotgun upgrades are gated behind Gauss Weapons and Alloy Cannon, Underbarrel Grenade Launcher upgrades are gated behind Plasma Grenade and Advanced Grenades, and Underbarrel Flamethrower upgrades are gated behind Advent Purifier Autopsy and Andromedon Autopsy (neither of these need the corpse however, just the autopsy).

- The Underbarrel Shotgun has a new range table. As inaccurate as a LWOTC shotgun at range, and as accurate as a LWOTC SMG up close. Their damage has been buffed, mainly for Mag and Beam tier, to match that of full size shotguns in LWOTC, although with lower max damage. Crit damage and crit chance is also lower than a full size shotgun, and they can't be used for skills like Trench Gun or Street Sweeper that require a primary shotgun. All Underbarrel Shotguns now do a very small amount of environmental damage (1).

- Underbarrel Grenade Launcher range (other than Beam tier), radius and environmental damage has been nerfed, while damage has been buffed for Mag and Beam tiers. Beam tier uses Blaster Launcher targeting.

- Underbarrel Flamethrower cone size, both length and width, have been nerfed to 1 tile less than the LW Gauntlet Flamethrower (without Incinerator) for Mag and Beam tier. Conventional tier is even smaller than that since they can be acquired for free. Beam tier has 1 point of Shred now to reflect the acidic nature of the chemical mix it uses. Underbarrel Flamethrowers no longer do any environmental damage, but still can set terrain on fire which can lead to terrain features crumbling over time.

- Underbarrel Flamethrowers only have 1 charge, and the Underbarrel Flamethrower Tank item only grants 1 additional charge.

- The Quickburn skill now can affect all 3 tiers of the Underbarrel Flamethrower.

- Utility slot versions of underbarrel ammo items now have 1 weight each.