Step 7: FIRE!
take to a desolate area (or your driveway) and fire away from people with the heavy stuff like the batteries.
make sure if you must fire at someone (which you will) then keep the pressure low (20-35 psi)
40 psi stings quite a bit with a nerf dart
WEAR EYE PROTECTION, i cannot stress this enough.
Be safe, have fun, and my next project is a tri-barrel airsoft shotgun so look for that one as well