The article said they're single action. I noticed the later ones are double action.
Do you carry the single action ones with the hammer back with the safety on like a 1911?
There really aren't any double action Hi-powers. The Hungarian one that is double action, only looks a little like a Hi-power. FEG also makes an exact clone in single action.
Browning has made a bunch of pistols with double action/fast action etc. but they are not really Hi-powers either.