Rifled barrels already existed at that time. It's just that reloading took forever, because you needed to literally hammer a bullet down the barrel, so they were seen as impractical for military purposes.
Am I the only one who kinda wants to see more medieval fantasy series from the point of view of a a rank file solider...
Nicholas Russell
Samuel Foster
Good to know, so the gun is still unrealistically advanced nonetheless.
Jaxson Thompson
The early modern period was the golden age of mercenaries rather than the middle ages.