In 1791, when the Second Amendment to the Constitution was ratified, the majority of firearms were of flint-lock firing type: Pour in powder, ram down wadding and lead ball, shoot, repeat. At best there were three shots per minute.
The framers of the Constitution could not have imagined a gun held by a single shooter capable of doing in one minute the “work” of 33 riflemen.
The AR-15 fires up to 100 rounds as fast as the trigger can be repeatedly pulled in the same short period of time.
Modern technology has made the Second Amendment a defense of slaughter. It is time for it to be repealed.