Start by not editing the forge rules and then start forge on any map.

Once it has started, spawn up a random weapon (note that the battle rifle works best for this trick).

Make sure your aimer is on the little marker that each item has. Pick up the weapon, go into forge mode, and delete the marker for the br. Do it quickly.

When done a spartan his both their hands up like they are getting ready for a fist fight and elites look like they are wielding an invisible energy sword.

Press Y when you want your weapon out again because your assault rifle stays on your back the whole time.

You can throw grenades, use equipment, and go into forge mode while doing this.

But if you drive a vehicle, your weapon will be in your hands, and elites can punch while doing this, spartans cannot.