Dola and her pirate gang all use single barrel break-open grenade launchers that fire explosive and gas rounds. Pazu obtains one from Dola when he goes to find Sheta.
Gatling Gun
In the first Scene Where Dola and her gang raid an airship, two crewmen fire a hand-cranked Gatling Gun.
Webley Mk VI
Muska and his men wield Webley Mk VI revolvers to fend off Dola's gang. Muska also uses one to shoot at Sheta, and the commodore uses one to shoot Muska's hologram.
Hybrid Short Magazine Lee-Enfield (SMLE)
All of the soldiers seen in the film carry hybrid SMLE bolt-action rifles, due to the slightly longer barrel of the No. 4 rifle and pseudo Gewehr 98 Lange-Visier sights. The rifles are depicted with five round magazines instead of the better known ten round magazines, which is plausible since the Lee Enfield's magazine could be detached and swapped in the field, thanks to the small lever in the trigger guard.
Maxim M1910
The fort's arsenal includes a Maxim M1910, which is used to try to defend off against the Laputian robot.