I know it's a day late, but Merry Christmas guys, I hope someone finds this useful.
Link to instructions here:
http://www.instructables.com/id/Reusabl ... gun-Darts/

And a quick video on the actual making part. Measurements are in the link above:
[youtube][/youtube]
This is essentially the same dart design used on my burst disk gun I posted a year ago. Here's a damage pic from that to hold you over till I make a new video:
