This is my knex crossbow! I was messing with having an adjustable stock. It isn't great, so if you don't like it, make it a solid stock. I think you can figure out how.
Sorry if this doesn't all make sense. I took the pictures a while ago and I think I got them all, but there may be a few missing.
Note: It's very accurate and very powerful! Don't shoot anyone!

Step 1: The Main Panels & the Bow

The main panels & the bow
Make 2 of each of the panels, and one bow.

Step 2: The Internals.

Sorry if this doesn't all make sense. I took the pictures a while ago and I think I got them all, but there may be a few missing.
Note: You don't need to make the adjustable stock if you don't want to . You can make it solid if you want.