Time for another monthly Q&A video - thanks to my supporters on Patreon for helping to make this possible! I have a whole bunch of questions this time, and have timestamps for each individual one here:

0:52 - Barrel length in terms of bore diameter
3:18 - Why did the XM8 fail?
http://weaponsman.com/?p=5715
9:22 - Why are so many Japanese Type I Carcano rifles in unissued condition?
12:13 - Hammer bite - what actually happens? (high speed footage)
14:12 - What does my own gun collection look like, and what gun am I interested in?
19:52 - What's the deal with flechettes?
22:41 - Will I be making more gunsmithing videos?
23:40 - What elements would I incorporate into a gun of my own design?
26:17 - What WWI gun would I choose to take into WWI?
27:45 - How is the Ruger 10/22?
29:50 - Why was England the only country still using a revolver as a standard sidearm going into WWII?
32:32 - Were there any semi auto or full auto black powder guns?
33:46 - What are the pros and cons of tilting vs rotating bolts?
36:15 - Have people tried using stronger materials than brass for cartridge cases?
40:30 - What was the best overall 19th century single shot breechloader?
42:37 - Were there any types of multi-shot muzzleloading rifles?
44:51 - Why did it take so long for metallic cartridges to enter military service after they were first invented?
48:22 - What are my thoughts on 3D printed guns?
link to defcon at 50:15
50:35 - Which last ditch rifle would I pick to use?
51:50 - When will I visit Europe, and what do I want to see there?