Removing the barrel from the slide requires a take-down tool.

I use a 3/8 punch, and place it into the hole in the barrel locking system, as shown.

Holding the slide with your left hand, pull the barrel forward until it releases from the slide.

Be careful of a big "sproing".

Slowly let the pressure off of the spring and the barrel will come off of the slide.

Remove the spring from the barrel.

You can now clearly see the roller-block assembly that is the heart of this strong action.