The Amazing World of War Machines video series

Not sure if you have seen this series, but very good.
I was watching this last night on Amazon Streaming, a great detailed series on Firearm and Grenade development, history and far more.
Not in HD on Amazon streaming,but may be on DVD ? only $7.00 at amazon for the DVD below, or free on Amazon Prime streaming. Worth the watch.
Link Below:
If you know of other good videos, please share.