I got an older HF Dual Mig 130 at Pomona car swap meet for $50 10 years ago. It's Italian, not Chinese. It uses standard M8 tips and its all set up for gas but I have yet to run it like that. I got a Bottle and a regulator, just never needed it. The HF flux wire was terrible, but the new Hercules or Vulcan (?) .030 flux wire runs like butter, and barely spatters. My only gripe is the weak feed tensioner on it and the limited hi-low, 1-2 amp switches. I probably need a new Miller style knurled drive wheel (they do fit). Duty cycle will cut out on you before your done. Weighs about as much as a large car battery.