While I am not a fan of semi-automatic rifles in any private citizen's hands, it is their right. But, more importantly, when the justification to raise the age from 18 to 21 because of lack of maturity is presented, I don't buy it. Not because I don't agree, but rather it conflicts with 18 is ok to serve in the military, which tells me that anything will be said to get their way. Additionally, one does not kill because they own a gun, they kill because they have a mental illness. Once again, the proposed solution does not solve the core problem.