Ruger’s YouTube channel
Unbeknown to me, Ruger has had a Youtube channel since May of this year.
Last week they started a series on the history of firearms. The first episode, about early hand cannons, "aired" last week and is worth watching.
Also online are Part 2 and Part 3.

Cool Hope to see more SR-556 videos.
Greetings from Texas,
This is a fantastic video. Gives me many ideas.
Having pursed near- and far- East Asian studies, I can say that the Song dynasty used explosives to military advantage as early as the 10th century, and projectile weapons in the 12th century – almost two centuries before documentation in Europe.