Gravgun (sometimes written GravGun) is a short username meaning Gravity Gun, a big yellow-lighting metallic gun you can found in the Half-Life² game series. It can pull, push or launch objects towards zombies (including launching sawblades), or standard humans I don't like. It is also my username. MAH username!
I also compress PNG files.
Oh and sorry for the Sending Device - Switch.png double upload, didn't know server cache takes 10-15 minutes to update.