Kerr's Patent Revolver was an unusual 5-shot single-action revolver manufactured from 1859 to 1866 by the London Armoury Company. It was used by Confederate cavalrymen during the U.S. Civil War. Seven of these revolvers were held by the New Zealand Colonial Defence Force in 1863 and were issued to the famous Forest Rangers at the start of the campaign to push Māori rebels out of the . It is easily recognized by its side-mounted hammer.