If all the sudden you couldn't buy an AR-15, what would you lose? Would you feel your second amendment rights would be eroded?
Yes, they would be eroded, and what is worse, it would have zero effect on school shootings. A 9mm semi-auto pistol might be the next weapon used, and then the loons would want to ban them.
It is sad indeed, when an entire segment of our public cannot imagine any solution to a school shooting beyond restricting guns.