In todays Front Sight newsletter, Dr. Piazza said that its okay to practice in your home and dry fire modern firearms with free floating fireing pins. Goes against everything I was ever taught. Here is the link, read it for yourself.
I trust Dr. Piazza, been to Front Sight and love it. Dr. Piazza actually wanted me to move to NV and work for him. However, I think I will still use Snap Caps.