The following firearms were seen used in the anime Eureka Seven and the movie Eureka Seven: Good Night, Sleep Tight, Young Lovers:
Renton Thurston is given a Beretta 92FS by Moondoggie in the beginning of "Helter Skelter." He uses the pistol in self-defense against Ray Beams but never fires the weapon. Moondoggie mentions that Eureka can also use the weapon, referring to her skills while with the SOF.
In the movie Good Night, Sleep Tight, Young Lovers, Eureka steals a Glock 17 from Gidget and takes an older Anemone hostage in attempt to stop the plans of the Gekko-Go crew.
Charles Beams uses a Karabiner 98k in addition to the submachine gun he used to storm the Gekko-Go with Ray Beams in "Helter Skelter." Before Charles dies, he shoots Holland Novak in the leg.