Snap On MW120 MIG Welder

A good friend gave me a Snap On MW120 mig welder. All it needs is a new liner and everything else works. He had a parts list for it but that's all. I guess I'm stupid because I cannot find a lot of info on it online. Some sources say it was made by Century and some say Snap On actually made it. I ASSUME the 120 means 120amps, although I've welded with it in the past myself and this thing breezed through 1/4 plate with a single pass very easily, so I wonder. Maybe it just has a really good transformer. It's 120V, btw. has a nice Tweko torch, like my Craftsman. I thought I would outfit one with small wire for thin metal and the other with either .035 or .045 for thicker stuff. Any of yall familiar with this welder? Thank you drive through.