system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Is there a fantasy setting where introducing firearms *wouldn't* drastically alter the world?

I daydream a lot, and a lot of the time it's about fantasy settings, going back in time, stuff like that. One mental roadblock I always run into is, "If i were to travel there, I'd want to bring a handgun or a rifle for self-defense." But in some settings [to name an example, the world of The Witcher or Avatar:TLA], I can't help but feel that if I were to die there, my firearm would be recovered and reengineered and drastically alter the course of that settings future. 

So what setting would it NOT make that big of a deal in?
gpt
Most. We've had cannons for a long time, and arquebuses for a similarly long time. They're expensive and difficult to manufacture safely, but they could be made. With that, they're basically more expensive, more brutal, and substantially less effective crossbows.

Things only really change when firearms are widely available, and the technologies neccesary to support their use are affordable and widespread. LotR would be the same, because no one could realisticly afford to support a gun that, when compared to the other options on hand, was impractical.