The following weapons were used in the anime series Kurogane Communication:
Spike's primary weapon is a Beretta 92FS.
The robot named Trigger always uses a small firearm modeled after a FN P90 (albeit with a large portion of the stock missing). The weapon's ammunition seems to consist entirely of plot; it is shown as being a live-fire weapon, an airsoft gun, and a grenade launcher, all determined by what is needed at the moment.
Fictional Assault Rifle
During Angela's flashback to her life before the war, several soldiers led by Angela's owner try to destroy her with a futuristic assault rifle design.
Heckler & Koch USP
Both Honi and Kanato carry Heckler & Koch USP pistols equipped with threaded barrels and chambered for .40 S&W (both lack the USP Tactical's signature sights). Honi's USP's only modification is the threaded barrel, while Kanato has added a rifle flash hider and what appears to be a laser and/or light module to his.
Lillith & Alice try to destroy Angela with a generic rocket launcher to little avail.