I created this for a customized Nerf Roughcut. I had spare time, wanted extra ammo storage, and created this. Credit to waltherion and AMS3000 for the original files.
Clamps onto stock "tactical" rail of your Nerf blaster, holds up to 8 extra darts. Sights line up well for me, but YMMV. Enjoy!
UPDATE 2/22/2017- The dart holders might be a bit too tight for some users and darts. I recommend sanding them down. I also plan on uploading a version with wider holes, but this obviously will not be an immediate update.
I would also appreciate it if you post a Make if you have downloaded and printed this creation. Even just commenting an Imgur link to your print is appreciated.
I have also been told that this was marked as Adafruit's "3D Print of the Week." Thanks guys!
The original creator of the dart holder, Waltherion, says that he recommends "M2.6x8mm Phillips Drive Flat Head Self-Tap Electronic Screws." You will need 4.
However, I managed to find something small enough lying around in my garage, so who knows.