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Its actually harder make a cart than a saddle. You could technically just throw a carpet on the back of a horse and ride it, then maybe use like special boots with spurs like the cowboys to steer it. Even then making a basic saddle isn't that hard. Cart making is its own entire thing since that requires a good deal of math to actually be able to make circular wheels, strong enough axels and good enough construction so the thing doesn't fall apart when it hits a hole.
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To be fair, I assume most people are glorified shanty towns at the moment.
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100+ years might be asking a bit much for old revolvers, especially if they haven't' been treated well. Also consider this: what are you trying to learn from them? The firing mechanism? Well you can learn that but then you'd need to learn about the bullet. You likely have no idea what combination of chemicals the powder is made of and forget about the primer's materials. That's generally the thing that just because you have a thing doesn't mean you can fully remake it. You have no idea the type or quality of metal used to make the gun and if you did know, you probably don't have the facilities to make it yourself. This is something you see when people ask why didn't X country just remake Y country's stuff in WW2? Its because looking at a tank hull gives you jack shit in the processes used to make that tank hull.
Also doesn't gunpowder like go bad after a while? If its been a century at least then I can't imagine a lot of it would be advisable to use.
They're
very well treated 100 year old revolvers. Almost never fired, there weren't many situations like that that arose in the bunkers (not the ones that made it to the days of New Jericho, at least. Using lethal weaponry on people in such a small community is likely to stir up an awful lot of trouble). They're also highly corrosion-resistant, being made in a society advanced enough for the megacities the size of what we see on the map
In regards to:
"Its actually harder make a cart than a saddle. You could technically just throw a carpet on the back of a horse and ride it, then maybe use like special boots with spurs like the cowboys to steer it. Even then making a basic saddle isn't that hard. Cart making is its own entire thing since that requires a good deal of math to actually be able to make circular wheels, strong enough axels and good enough construction so the thing doesn't fall apart when it hits a hole."
Sure, but that's not really a saddle. Don't get me wrong, bareback/saddle-less cavalry was a thing, but it's considerably more difficult. Saddle-making, even in the modern day, is the job of an artisan, because they're tailored to each horse's back. It's not the largest issue, though, that would be how valuable horses are at this stage in development.
I don't buy wheels are hard to make though. You can make a near-perfect circle by putting a peg in a board, tying a piece of string to it, and tracing a circle on the board. Find a straight and thick enough stick and that will be a sufficient axel. Carts, even well made ones, always run the substantial risk of breaking an axel or something by running into a hole, the trick is to avoid the holes. And the Jerichians have some mathematical knowledge, they're descended from the wealthiest of the old world, who were fairly intelligent and had jobs that required them to be good at math.
Yes, I suppose most people are shanty-towns. But for guns to be put to their best use, they have to be made en-masse, their biggest advantage being you don't need to train for a decade and a half to use one competently. Also, you need the population to field large armies, which NJ doesn't have, being a shantytown.
*Should clarify that the revolvers have been rarely fired after the Jerichians got out of the bunkers. There's not a lot of room for mischief in this situation. If you're a criminal delinquent, you get scapegoated to the southern wastes.