For sale is a Lincoln LN 25 Wirefeed. This gun uses the welding current to power itself and can use both CC as well as CV current, as it has a variable speed control for wire feeding, so it adjusts wire feeding speed to achieve perfect MIG welds.
It includes a used gun for 0.045 fluxcore wire, which for some reason does not have the gooseneck part. I do not know if it is normal, but parts are easy to find. What is much more important, it also comes with a BRAND NEW MAGNUM 400 MIG GUN, which was never used and fits the wirefeed perfectly. I checked it out and it works fine. Check out the pictures, they show everything in great detail.