Here is an overview, with my remarks on the design:
https://youtu.be/p7xOOagdFMY
This is a model for a Nerf Holster that latches so that your blaster will not fall out when jostled or if you intend to run around. You won't need much external hardware, just some super glue or some screws to affix the rail piece onto your Nerf blaster of choice.
If you are gluing it, I recommend Gorilla brand gel super glue, but Epoxy sounds like a promising option as well, though I have not tested it.
If you are using screws, I leave that up to your discretion. I used some self-tapping screws I found laying around, and I'm not entirely sure what type they are.
NOTE: Affix the rail piece with the tapered end facing the front of the blaster. This makes the holstering smoother, and will not cause your blaster to become jostled loose.
I recommend printing with 20% infill with 5 walls for best results.
The author marked this model as their own original creation.