Lewis and Clark's Girandoni Air Rifle

I'm not into guns at all, but I just happened to stumble across this video last night and thought it was really interesting. Who knew they even had airguns nearly 300 years ago, let alone great ones? It's also interesting the way Lewis and Clark performed demonstrations of it everywhere they went so that the Indians never attacked them. I always wondered how they managed to trek all the way across the country without getting killed by Indians.

Here's another video showing a replica of that same rifle being fired.