For Jumbofrank, a single action means, cock the hammer and pull the trigger, it go's bang, single action self loader means, you charge the action, ( load the cartridge ) and pull the trigger and for each depression of the trigger, a single round should fire. A double action has 2 modes of firing, cock the hammer and pull the trigger, or just pull the trigger which cocks the hammer and fires the cartridge. Wikedia be damned, and the link provided nothing. This is just a pet peeve nothing more.
For XDlover, I think the 10/22 action is cool, it has many add ons, to improve the basic firearm, and I walk the walk and talk the talk. No arm chair soldier here.