It dose not work. Look at the countries around the world that have strict gun control laws and they still have gun deaths. The only way to stop the killing is to make judges uphold the law and address the mental health issue. These crimes were commited by people with severe mental health issues.
Israel to cut VAT to 17%, corporate tax rate to 25%., says Netanyahu (Reuters)
from the article: Ex-Rep. Giffords visits Newtown shooting victims' families