Firearms before their time
Breech-loading matchlock arquebus, Nuremberg 1470
More about this breech loader here
Plan for a nearly identical weapon from a manuscript from 1456 by Lorenzo Ghiberti
Eight barrel matchlock revolver from 1580 Nuremberg
Breech-loading wheelock pistol, ~1560, German
Matchlock breechloader for Henry VIII (one of two he possessed, and used multiple times for hunting) – 1537
This was originally a wheel-lock
https://collections.royalarmouries.org/object/rac-object-264.html