I played D&D back in the day. Dungeons and Dragons. Yeah, I was cool like that. Lot's of guys were back then.
Well they are coming out with a new version to try to fuse the community back together. There have been schisms over which rules version is the One True Version. Arguments over Canon are legendary across the internetz.
Well, there is a common problem. The game is swords and arrows and magic. But there is always some munchkin of a player that wands to mix sulphur, charcoal, and saltpetre and thus have a gun. With this invention he can leapfrog up to USS Iowa and Sherman Tanks, and take over the world, thereby 'winning' Dungeons and Dragons for all time.
How to deal with such shennanigans?
Easy! Let em have it! Give them all of it. Plenty of powder making materials and a 'hand gonne'. Inform them that while it will do marginally more damage as their crossbow, but at one third the rate of fire. Plus it's heavier.
They usually respond with, "Well, I invent a Ma Deuce next!" Fine. Describe even the fundamental of how to construct a Ma Deuce. Satisfy a Dungeon Master with that and you only have to wait 200 years of constant study and effort in a single minded industrial pursuit to get the technology up to mere Gatling level. Sheesh.