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The 1895 Nagant as adopted by Imperial Russia was a bit of an odd one. It's double-action, single-action, with a unique sealing system and a special cartridge designed to facilitate it.
The 7.62x38mmRG Nagant cartridge may have a reputation for being particularly weak, but much of that reputation comes from much later commercial target shooting loads, the actual old Imperial load has energy roughly comparable to .38 Special, so it's actually not that bad in that department. What makes it stand out visually is that the cartridge is 'uncircumcized' as some would say, in that the brass casing is extra long and the projectile is seated deep inside it (a bit like a wadcutter, actually), with either a slight taper past the projectile, or an odd little curled 'crimp' which leaves a distinct lip on the mouth of the case.
The idea of this cartridge design is to exploit the obturation qualities of brass, the casing continues out the front of the chamber, and then the gun's action cams the cylinder forward as the hammer is gonna drop, where the brass expands out into the forcing cone as the cartridge fires, tightly sealing and leaving no cylinder gap. The purpose of this is to increase velocity, but in reality it doesn't make a huge difference and is honestly pointless from that perspective, also making for a single-action trigger which is bearable, though stiff, but a DA trigger which is legendarily heavy.
Famously, an unintended benefit of this stupid system is that it makes for a 7 shot handgun which one can put a silencer on, and it can be very, VERY quiet. The later Soviet NKVD would use 1895 revolvers with custom made silencers for some of their shady dealings.
Beyond that, it's a workable handgun, assuming a supply of ammunition, and it's best used in single-action for any kind of effective accuracy, but the reload is a bit like a Colt 1873 if it was fucking retarded, so like the German Reichsrevolver, it's not something you'd stop to reload if you could help it.