After reading a lot of the comments in this thread, I thought it worth mentioning a few things, first is the "right" to keep and bear arms, has become focused on the weapons themselves and not the reasoning for that right.
In no particular order, early American settlers viewed the right to arms and/or the right to bear arms and/or state militias as important for one or more of these purposes,
deterring tyrannical government;
repelling invasion;
suppressing insurrection;
facilitating a natural right of self-defense;
participating in law enforcement;
enabling the people to organize a militia system.
Second Amendment to the United States Constitution - Wikipedia, the free encyclopedia
It is a long and well established principle that the "right" to bear arms is given under the constitution more so that the people of this nation may have some final control of their own destinys and act as a check and balance from a Govt. that may act in contravention from their wishes as well as those mentioned above. The weapons themselves are mere tools and have changed greatly since the time the constitution was founded. However, most will agree that these "rights" are not unlimted, in that in most states, there is existing gun control. In fact, the very act of a background check is a method of gun control. To seek though to limit arms to the those Americans that should enjoy them under the constitution is to punish those who have commited no crime other than purchase a tool by which others have an objection too. While it's true that some weapons are limited and I tend to think that through some common sense legislation weapons like the AR-15 and the AK-47, can also be legislated without the need to infringe upon the rights of those law abiding Americans who have done nothing more than exercise the "right" to keep and bear arms.
Our nations founders took this Amendment as seriously as any other, Jefferson, Madison take your pick and as such unless this nation seeks to Amend the 2nd Amendment which we all fully entitled to do, then it should be respected as much as any other.
In a nation governed by the people themselves, the possession of arms to defend their nation against usurpers within and without was deemed absolutely necessary. This right was protected by the 2nd Amendment. Thomas Jefferson
"One loves to possess arms, though they hope never to have occasion for them."
--Thomas Jefferson to George Washington, 1796. ME 9:341
"No freeman shall be debarred the use of arms (within his own lands or tenements)."
--Thomas Jefferson: Draft Virginia Constitution with (his note added), 1776. Papers, 1:353
"The right of the people to keep and bear...arms shall not be infringed. A well regulated militia, composed of the body of the people, trained to arms, is the best and most natural defense of a free country..." (James Madison, I Annals of Congress 434 [June 8, 1789])
One last thing on the issue of regulating Arms themselves,
It is a common misconception[13] that an individual must have a "Class 3 License" in order to own NFA firearms. An FFL is required as a prerequisite to become a Special Occupation Taxpayer (SOT): Class 1 importer, Class 2 manufacturer-dealer or Class 3 dealer in NFA firearms, not an individual owner. Legal possession of an NFA firearm by an individual requires transfer of registration within the NFA registry. An individual owner does not need to be an NFA dealer to buy Title II firearms. The sale and purchase of NFA firearms is, however, taxed and regulated, as follows:
All NFA items must be registered with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF). Private owners wishing to purchase an NFA item must obtain approval from the ATF, obtain a signature from the Chief Law Enforcement Officer (CLEO) who is the county sheriff or city or town chief of police (not necessarily permission), pass an extensive background check to include submitting a photograph and fingerprints, fully register the firearm, receive ATF written permission before moving the firearm across state lines, and pay a tax. The request to transfer ownership of an NFA item is made on an ATF Form 4.[14] Many times law enforcement officers will not sign the NFA documents
National Firearms Act - Wikipedia, the free encyclopedia
The point is, to use a tragic event to take away a "right" serves no useful purpose because it does generally it is done so in haste and often times the measures themselves punish those for crimes they do not commit nor ever will. I suggest for the tragic events in CO. we focus on the victims here, and advocate for punishing the real Subject here rather than Americans who grieve with them. Then perhaps, we can focus on legislation that might perhaps take into consideration everyones feelings on the matter.