Chipman has made his stance clear in that he would definitely take away all semi-automatic rifles with detachable magazines. There's an interesting statistic by the government in which it shows that 8x's more people are murdered by knives than by rifles. Strangely, I don't hear the public clamoring for background checks on kitchen knives, steak-knives, butcher knives, fillet knives and hunting knives, or confiscation.
China: 29 dead and 133 injured in a terrorist killing spree.
Japan: 19 dead and 29 injured in a one man killing spree.
For those that would agree with Chipman, ask yourselves, how many of the tens of millions of "law-abiding' gun owners committed violent crimes?