I bumped into this a little while ago: https://www.thingiverse.com/thing:2905454
It got me thinking about making things for Nerf accessory rails just to look neat. I've got a few other ideas, but let's start with this.
Big hat tip to Theo Stylianides for the inspriation: https://www.deviantart.com/sttheo/art/Knight-Zero-sheet-614205426