I am looking for a selection of accessible, detailed resources for gunpowder weapons for help in some creative writing. Particularly muskets/pistols from the later 18th century, Napoleonic era up to the end of the 19th century.

Sources which document the construction and development of muskets such as rifling and firing mechanism advances.

I have found the Schola Gladiatoria youtube channel excellent for information about the types, uses and development of swords in the era (for example the shift from pipe-backed sabres to the Wilkinson-style blade in the British Army), especially as most of his videos are based on genuine antiques and historical recorded sources of their use, so something like that would be ideal but also books/essays would be a great help.

Thanks