Heavy Minigun Exploit

Edit: This was fixed by valve.

A heavy exploit has been found that allows you to run at full speed while firing the mini gun. The steps to achieve this exploit:

• Fire until you run out of ammo and continue holding down fire to keep the gun spinning.
• Let go of the fire button for a moment and then fire it again. If you time it correctly the gun will rotate and you will be moving at full speed.
• Now hold down the secondary fire and let go of primary fire.
• Hold down secondary fire until you die and use primary fire at full speed.
  

Here is a video of someone preforming the exploit.