- "Napalm B-based incendiary explosive; creates lasting chemical fires that reach temperatures of 1200 degrees Celsius."
- ―Armat U4 Firebomb description (from Aliens: Colonial Marines)
The U4 Firebomb will erupt on impact, creating lasting chemical fires that can reach temperatures of 1200 degrees Celsius.
The U4 Firebomb is also the primary ammunition of the U4 Firebomb Launcher.
- The Firebomb is very effective in tight corridors where it can completely block an enemy's path.
- In Aliens: Colonial Marines/Stasis Interrupted (video game) The U4 Firebomb is a Tactical and is effective against Xenomorph and Weyland-Yutani PMC targets. The U4, unlike the M40, cannot be held or cooked. Once you press the button, it is thrown and explodes on impact. The U4 is unlocked at Rank 2.