WORKING METHOD!! As of playlist update 59.9.17.7.0

Step 1: Get the EE Gobble gum
Step 2: Buy the RK5
Step 3: Go up to the Shieva wall buy, Buy the Shieva, wait a split second then use the gobblegum and double tap Triangle/Y
Step 4: Press up on the D-Pad, if nothing happens, the glitch worked, if not then restart..
Step 5: Build the zombie shield
Step 6: Pick up a DM drop
Step 7: That's it, you're all done, all you have to do now is wait for the timer to get to 0 and you will have the unlimited death machine..

If you run out of ammo on it, pick up a max ammo and it should become unlimited ammo

[ Register or Signin to view external links. ]