Source: @royalarmouriesmuseum on that ByteDance-owned site
Edit 2: OK it’s not this guy but I’ll leave it as it was; original edit below:
Jonathan Steven Ferguson is a British firearm historian and author who is currently the Keeper of Firearms and Artillery at the Royal Armouries Museum in Leeds, England.
Thanks @[email protected] :)
It’s not him on the video though! That is someone else