I bought a Lincoln 255 mig welder. The mig gun works okay but it's a little on the big clunky side. An suggestions on a good replacement? I've seen Tweco and others that seem lighter and smaller. Does it make any sense to upgrade this or should I just stick with the stock Magnum 250L gun? Are Tweco's the best? If you know the part number of a suggested replacement gun please include that, I noticed Tweco has many different guns with the same specs but differnt part numbers.