The Colorado movie theater shooter had two 40-caliber Glock handguns, a Remington 870 single-barrel pump shotgun and a Smith & Wesson AR-15 assault-style rifle.
All purchased legally.
I happen to believe the Constitution, whether you agree with the 2nd Amendment or not, does, in fact, guarantee the personal right to bear arms. And I also think people should have the right to defend themselves. And hunting for food should certainly be allowed. But the founders did not envisage modern weapons. Reasonable limits should somehow be possible, shouldn’t they?
Where does it stop? Does the Constitution allow someone to own a personal anti-aircraft missile? What about personally owning atomic weapons?