>>96350179
Depends on the nature of the gun? If it's just a pot on a stick that needs a dry lit fuse held in another hand or by another person altogether to fire, needs dry well mixed and rare powder to work and has the chance of wounding the user, then it doenst really break immersion much for me. They make good weapons for the stupid, insane, or desperate, like goblins. Larger cannons and bombs also make good siege weapons but are crap for battlefields or skirmishes, due to the time it takes to load them and the cost/difficulty in getting hold of, storing and using large amounts of powder,
When a player tries to argue though that their character can invent and use a pair of reliable six shooters, a bolt action sniper rifle, a machinegun or hand grenades, just because they the player knows what they are, they can fuck off. They are playing a character in the setting I am running, not playing themselves with the 21st century knowledge they have.