The keys for the internal lock above the cylinder release.
Moon clips (full, not 1/2 or 1/3) are still the fastest way to load 6 and eject 6. I use a 625 JM in USPSA/IDPA matches with NO issues at all.

Some (even on this forum) will tell you that moon clips are a major pain... that you are so much better off using .45 Auto Rim casings...not so at all.
Many home made tools for unloading the clip....I use the California Comp de-mooning tool that is in the Dillon Blue Press to do that...every squeeze kicks out two empties.

I just use a regular pair of pliars open to the widest setting to load them....Easy Cheesy!

Randy