First you might want want to use the kind of gun that is displayed
What you need:
rubber band gun,
a little time
Step 1: Step 1
With the razor in your hand take a look up the underside of the gun above the trigger guard.
Step 2: Step 2
Cut off a small notch above and behind the trigger that keeps the gear from turning.
Now load on as many rubber bands as you can and watch them fly all at once.
The finished product should look like this.