What's wrong with the 1006 trigger is that the trigger play spring is either loose, broken, or missing.
If you press the trigger double action, and then keep pressure on it till it resets, then repeat, you'll never notice it.
Otherwise, you need a little brass spring, with a rivet that holds it in place.
This is both very common and not a big deal.
Best of luck, and I have to say, a Sig 220 in 10mm makes me want a Sig 220.