Semi-Automatic Crossbow

I was a little underwhelmed with the miniature weapon selection on the site, so I spent a couple of hours working on this. Load the magazine up to ten shots, and it will fire one after another.
Tips:
Assemble with computer hard drive screws (you know, the smaller threaded ones)

Holes, for the most part, are all 10mm apart, very easy to make further attachments.

I really don't know why I have to explain it to everyone I hand this thing to, but here's how you fire it (properly).

1) Pin