Nali Weapons 3 is a new weapon pack for Unreal Tournament, containing 17 new weapons, new pickups, ultra gore, nukes and more.
This is the Nuclear Launcher. It can carry 5 types of missiles corresponding to 5 "nuclear levels", being Level 1 the weakest and Level 5 the strongest nuclear explosion.
The first fire is a regular nuclear missile, while the second is guided (like the Redeemer).
I've found ammo pickups for this on a couple of Monster Hunt maps, but what does it replace? I didn't think the Redeemer had ammo pickups.