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:
https://www.amazon.com/Amazing-War-Machines-Various/dp/B0030VBGHC/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1526561447&sr=1-2-catcorr&keywords=the+amazing+world+of+war+machines
If you know of other good videos, please share.