How to make a ballistic knife

disassemble your Nerf Gun and locate this part inside the Nerf gun and set it aside.

Locate and take out the spring that is found in the Nerf Gun.

Locate the air chamber which should also be located near the spring. you then want to get a small drill bit and drill two holes shown above. (the second hole should be drilled the direct opposite)

finally take out the metal rod that is located at the top of the gun (internal gun)