I can try. This system starts to fall apart, but it should get you through.... If the gun is a 3 digit model number that starts with "6" It means stainless steel. The same number without the six means blued steel. For example: A 629 is a stainless steel .44 magnum, while the 29 is a blue .44 magnum.
A 3digit model number that starts with "3" generally means it is their "scandium" alloy - super light. The 329 is a .44 magnum, made of super light scandium alloy.
Then you have frame sizes.......and frankly I'm not sure there is a "system" to how their numbers fit into frame sizes, you just kind of get used to what is what after a while.
The most common you'll hear about are: "J" - think "snub nosed" pocket sized, five shot revovlers. Note also, that they don't HAVE to be 5-shot (the .22 caliber J frame 317 holds 8 i believe because the round is so small, but you get the idea.
Next is K/L You hear these used almost interchangably, but there is a small difference. The "L" is what the newer magnum guns are built on, and it is a little stronger/bigger. An example of an L is the 686 you mentioned above. Again, capacity depends on caliber, but many different calibers will be built on the same "L" Frame. (PS - 686 has adjustable rear sights while the 620's rear sights are just a channeled groove in the frame.) There can even be variety here as you can get a 686 in 6shot, or a 686+ in 7 shot. Same frame. There are also different barrel lengths available, and to my knowledge, barrel length doesn't change model number. A 686 is still called a 686 no matter if it has a 3", 4", or 6" barrel. You would just say "I have a 3" 686."
Next frame size (and the biggest, except for the monster .500 SW mag) is called "N." N frames are your classic big revolvers. The N frames are pretty much only the larger calibers, .44, .45 colt, down to as low as .357 (of which they make a really neat 8 shot version. I don't think any calibers smaller than that come in the N frame size. The "N" is what most people think of when they think of revolvers. Big, heavy, easy to shoot, fun.
For what needs you have described, I think you want a K/L frame as well. The N is probably too big for what you want it to do (especially if you have decided to go .357) For your first gun, make sure it is steel, not scandium. And if you are packing it around camping and stuff, the 6" barrell will be mildly inconvenient, but the 4" is just about perfect. You can sneak a little more ballistically out of the .357 with a 6" barrel, but for me a mid sized steel, 4" gun is just about perfect for anything you'd want to do.
I'd opt for the 686. The 620 is fine too, but if you ever wanted to sell it you'd have a thousand people asking you "whats a 620?"
If you absolutely will not take a gun with their lock (which I think is being too paranoid) then you are stuck with the older versions. In which case you could get a 586........ same gun, but blue!
Honestly though, just get a new one, make it yours. The lock will never trouble you, and your SW education will be well on its way.





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