When Scalia refers to regulating, he's speaking of the first part, a well regulated militia being necessary to the security of a free state,... I think he's talking about regulating the weapons in terms of what's reasonable and practical, not what's available. They can't take away the right to bear arms, and they can't regulate back to muskets only, but they can regulate to what is reasonable to maintain a practical civil defense force for personal or neighborhood protection.
- PJ