MHP 15

This is a mag in handle smg nerf gun, fully printed, except for the motor components. It uses Jet Blasters' Katana mags, and shoots half darts.
It comes in many parts, that are screwed and glued together for the final product. Some filing and sanding is required to make sure everything operates smoothly. Some of the screw ports may be a bit small, and I had to make minor tweaks, but it should be pretty straightforward.

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I have added a motor cover for 132 size motors (original fangs, titan hyperions, etc) but I have not printed or tested it yet.

https://www.thingiverse.com/thing:3134538
The pusher system is here. As it is a remix of other's, better, work, I didn't want to put it here, where it couldn't be credited easily.
THERE IS A NEW PUSHER DESIGN. I'm linking it here instead of the old one, and I highly recommend it

The parts you'll need are:
Screws that fit nerf guns
Short, but strong extension springs. like 1/2" short, and small.
An open flywheel project stryfe