This is a toy design project I designed during my last semester at school. It uses most of the internals of a Nerf Retaliator, or Nerf Recon Mk II. Standard Kit works, but the trigger bars may be too weak in their current iteration to work properly. If you want to take your shot at modifying and remixing this model, you're welcome to with the attached STEP file.
HARDWARE: Some parts will require bolts to be held together, or threaded inserts to attach different parts to one another. I used McMaster.com for all hardware
Brass Heat-Set Inserts For Plastic, 6-32 Thread Size, 0.150" Installed Length : 94459A280
Knurled-Head Thumb Screw
Slotted, Stainless Steel Low-Profile, 6-32 Thread, 1/2" Long : 91746A644
Passivated 18-8 Stainless Steel Pan Head Phillips Screw, 4-40 Thread Size, 2-1/4" Long : 91772A517
Low-Strength Steel Hex Nut Zinc-Plated, 4-40 Thread Size : 90480A005