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In the UK, the ownership of handguns is extremely restricted.
The only way to kind of own one is to have one with a very long barrel, and if it's centerfire, it may not be a semi-automatic, this means that of cartridge firing handguns, this is what you can own with a common license:
>a .22LR revolver or semi-automatic with a long-ass fucking barrel
>a centerfire revolver with a long-ass barrel
>either of these with a "counterweight" extension coming out of the rear of the grip, basically a long bar with a steel bulb on it, this allows the gun to have a not quite so stupidly long barrel by meeting overall length requirements
There's one more option though; cap & ball revolvers. Intended for antique style blackpowder competition, it's the kind of revolver where you load each chamber in the cylinder like an old musket; pour in the blackpowder charge, seat a bullet, add a wad or grease, then add a percussion cap on the chamber's "nipple" on the back, and that's one loaded shot, then you do that for the rest of the chambers.
There is nothing in the law to say that a cap & ball revolver must be of an antique design, however, so someone had a rather clever idea of just making what would be a typical modern double-action revolver, but instead of a cylinder taking normal centerfire cartridges or rimfire cartridges, the cylinder is like a cap & ball one, you pour the powder, seat a .357 caliber projectile, and then seat a shotgun primer on the rear of the chamber.
One company's idea was to simply import regular Rossi double-action .38 hand-ejector revolvers, then convert them to this modernized cap & ball setup, which would make them legal to own on a blackpowder license. To my knowledge, this is still legal to do in Britain's otherwise oppressive climate.