For that unit you buy a new gun. However, you should get no more than 12 to 13 feet. .023 and .030 wire doesn't feed well beyond that. The drive feeder is fairly good, but you shouldn't put more stress on it than you need for maximum life.
ISEKI TA 247. Stihl Saws Gravely Zt's Polaris ATV's State Of The Art Welding Equipment
Not a Push Pull. Just the high speed Pull. No sync. Gun pulls faster than the feed pushes so there's a little spin out on the pull end but it works ok.