Adapting from his book The Gun, Chivers traces how the design and proliferation of small arms, originating from both the Pentagon and the Russian army, rerouted the 20th century.

Mikhail Kalashnikov’s brainchild, Avtomat Kalashnikovais aka the AK-47, is the most stockpiled firearm in the world and has altered the last century like no other product. C.J. Chivers, author of The Gun, discusses.