I found these at Shot Show and have been awaiting their arrival. Designed in Canada and made in Germany these are a high security lock that fits neatly in the mag well and completely disables the firearm by locking the upper and lower receiver together, locking the bolt back, blocking the chamber and the mag well making it impossible to load a round or cycle the action.
These are not for those of you who just want to meet the minimum requirement by law, these well exceed the minimum requirement. The key is a security and key and can not be picked or easily drilled out.
Here is a short video demo.
These are in stock and ready to ship.