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The Enfield No. 2, a typical British revolver of the late 19th and early 20th era. Double-Action/Single-Action, top-break, when you break it open, it eventually trips the ejector star to lift all the chambered cartridges/spent casings out of the cylinder in one motion, this kind of design is pretty conducive to fast reloading, and though it wouldn't typically have the strength for higher powered Magnum cartridges or anything (not without some structural and mechanical changes), for service cartridges of the time, it's fine.
They're not cannons by any means, but they are fast and handy.
Those familiar with British revolvers might say this looks like a Webley, which it isn't, yet also totally is. The British Army was figuring around WW2 that the .455 Webley was larger than necessary, and that a lighter caliber would be easier to shoot in double-action, and thus held some trials. Webley & Scott submitted one of their designs, basically their .455 caliber one scaled down for .38/200, a specific load of .38 Smith & Wesson, and this design won.
The government then took Webley & Scott's design, and went over to Enfield and had them make it for cheaper, which had Webley & Scott go "Uh, excuse us, but what the fuck m8?!" and filed a lawsuit, because they had the audacity to just steal their design in front of their face.
The British government basically treated it as "Original character, donut steel!", claiming it was totally a unique design by Enfield, and initially refused to pay any royalties, though eventually gave in and paid them a token fine, hoping it would go away.
Later, the need for revolvers would become so large that they had no choice but to eventually start buying Webley & Scott's .38/200 revolvers anyway.