Good video, i enjoyed it. It sounds like you have allot of knowledge to share. I look forward to your future videos.
As to the constrictive criticism, i must dig a bit here because nothing really bothered me. All of the major potential issues were absent. Audio, filming and dialog were good. You stated that the rifle was made in Czechoslovakia rather than the Czech Republic, an understandable mix up. The sound of air moving through your work space spiked a few times, while it did not bother me it might bug some folks using head phones or so i gather from the comments on other Youtube videos. That is the best criticism that i can come up with, keep up the good work and thank you for the video.