Revolver
TL;DR
Revolver - requires enrichment with adjacent possible narrative
There were earlier designs of revolving firearms, e.g. c. 1580, but Stopler's design is often called the first revolver
What Had To Exist First
Preceding Inventions
What This Enabled
Inventions that became possible because of Revolver:
Biological Patterns
Mechanisms that explain how this invention emerged and spread: