Nerf Sentry Gun Tracks, Takes out Targets (VIDEO)

Nerf Sentry Gun

Nerf Sentry Gun (2)

Nerf Sentry Gun (3)

Nerf Sentry Gun (4)

The best part about this is that you too can make yourself a Nerf sentry gun! (And it’s not limited to Nerf guns, it was originally designed for paintball and airsoft, and who knows how long it’ll be before someone hooks one up with a real gun!)

(Holy shit can you imagine how ballistic people will go if someone 3D-prints a sentry gun with a 3D-printed gun inside? The internet could collapse.)

All you need to make your own Nerf sentry gun is:

Platform parts:

  • Wood: 5 mm, 9 mm, 15 mm plywood
  • 20 x 40 x 45 mm and 20 x 40 x 128 mm rectangular block of wood (you can also use the 1.5 mm plywood)
  • Junior drum throne
  • 2 x ball-bearing (12 x 28 x 8 mm)
  • Axial ball bearing (80 x 105 x 19 mm)
  • 12 mm wooden pole
  • Wood glue
  • Sand paper
  • Wood filler
  • Paint/paint brush
  • 15 x spax/wood screws M4 x 40 mm; 4 x screws M4 x 16 mm
  • 4 x wing nuts: M5
  • 4 x machine screws: M5 x 16 mm
  • 4 x brackets
  • Two component glue


  • Servo for the turn axis: BMS-660DMG+HS
  • Servo for the tilt axis: Hitec HS-805BB
  • Wire
  • Arduino Uno
  • TIP120 transistor
  • 1N4004 diode
  • 1k resistor
  • Pin header


  • Nerf Vulcan (e.g. here)
  • 6 Volt battery pack
  • 5 kg replacement spring for the Vulcan
  • Optional: Paint and plastic primer for the gun
  • 3 mm lead pearls or something similar as a counter weight
  • 6V 3700mAh battery pack
  • 9.6V 2000mAh battery pack
  • Webcam
  • Laptop


  • Drill (3, 5, 12, 28 (to fit the bearing) mm drill bits)
  • Sander
  • Scroll saw
  • Soldering iron
  • Claw hammer
  • Phillips Head screw driver
  • Hot glue gun

“Things like a scroll saw and a powerful drill are useful, but not a 100% necessary. I finished the whole tilt axis with just a fret saw and a cordless drill which was far too weak to drill the 28mm hole (I used the fret saw instead).”

All the instructions for the sentry gun can be found here. The whole thing is a Project Sentry Gun affair, get the software here.

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