O-rings are an easy fix and that would be a good platform to upgrade from, most of all Automag parts are interchangeable. Mind if I ask what the asking price is... it shouldn't be much over $100. You will want some sort of a force feed hopper because unless it has a level 10 bolt it will shred paint with gravity feed.
I have all the o-rings you would need to get it working and would have no problems helping you out and rebuild it.
Stay away from the RT, the valve, rail and trigger frame are only usable on that type of maker. It's a better valve than the Classic Automag but harder to upgrade the parts one at a time. They are easy to identify because the SS body almost completely covers the valve in the back.
I know this will look bad but with some explanation it's not that bad.