I originally emailed Pearce Grips when the Nano first came out, asking if they planned on manufacturing a pinky extension for the Beretta Nano. I finally got an email back.
If you want them to make one, go to their website and flood their email with the request. Let them know that we want it...
What direction is your mag spring installed from the factory?
As the Mag layout on the "Left" or "Right" of the following Picture, provided by "gb6491 of berettaforum.net"
1. Left
2. Right
3. Not sure. I didn't pay attention to how I took it out.