The first models of Enfield revolver were the.422-calibre Mark I and the.476-calibre Mark II. They were the official British military sidearms from 1880 to 1887. The.476 Enfield cartridge for which the Enfield Mk I/Mk II was chambered fired a lead bullet, and was loaded with of black powder. The cartridge was found to be underpowered, however, during the Afghan War and other contemporary Colonial conflicts, as it lacked the stopping power believed necessary for military use at the time. Unlike most other self-extracting revolvers, the Enfield Mk I/Mk II was complicated to unload, having an Owen Jones selective extraction/ejection system which was supposed to allow the firer to eject spent cartridges, whilst retaining live rounds in the cylinder. The Enfield Mk I/Mk II had a hinged frame, and when the barrel was unlatched, the cylinder would move forward, operating the extraction system and allowing the spent cartridges to simply fall out. The idea was that the cylinder moved forward far enough to permit fired cases to be completely extracted, but not far enough to permit live cartridges from being removed in the same manner. The system was obsolete as soon as the Enfield Mk I was introduced, especially as it required reloading one round at a time via a gate in the side. Combined with the cumbersome nature of the revolver, and a tendency for the action to foul or jam when extracting cartridges, the Enfield Mk I/Mk II revolvers were never popular and eventually replaced in 1889 by the.455 calibre Webley Mk I revolver.
The Enfield Mk. II was the issue sidearm of the North-West Mounted Police in Canada from 1883 until 1911. NWMP Commissioner Acheson G. Irvine ordered 200 Mark IIs in 1882, priced at C$15.75 each, which were shipped by London's Montgomery and Workman in November that year, arriving in December. They replaced the Adams. Irvine liked them so much that, in one of his final acts as Commissioner, he ordered another 600, which were delivered in September 1885. His replacement, Lawrence W. Herchmer, reported the force was entirely outfitted with Enfields and was pleased with them, but concerned about the.476 round being too potent. The first batch was stamped NWMP-CANADA after delivery; later purchases were not. They were top-break single- or double-action, and fitted with lanyard rings. Worn spindle arms would fail to hold empty cases on ejection, and worn pivot pins could cause barrels to become loose, resulting in inaccuracy. Its deep rifling would allow firing of slugs of between diameter. Complaints began arising as early as 1887, influenced in part by the British switching to Webleys, and by 1896, hinge wear and barrel loosening were a real issue. Beginning in late 1904, the Mark II began to be phased out in favor of the.45 calibre ColtNew Service revolver, but the Enfield remained in service until 1911.
