action

I've watched some videos of a few barrel changes and some use a barrel clamp, while others use an action wrench/clamp. Both appear to get the same job done. Barrel Vice: http://www.youtube.com/watch?v=ANK9KbXmMr4 Action Vice: http://www.youtube.com/watch?v=UPlFtskCwng Are there reason(s)...

Anyone use a action camera? I'm thinking I might want one but don't know much about them. Gopro seems to be a good one. My biggest question is how and where I would mount one. I use a crossbow with a red dot and a 870 with a scope. Any information would be great.