Honorable Senator/Representative Suchandsuch,
As we all mourn the victims of Sandy Hook massacre, before their blood is even dry, undoubtedly you will be hearing vultures screeching for more gun control. Before you succumb to your emotions, however, we, the rational, sane and safe gun enthusiasts, would like you to consider the following statistics:
1.Some 20,000 existing gun laws  on the books did not stop the shooter; there is no reason to believe that an additional one or two or dozen will.
2.Since the beginning of the 20th century and until the passage of the Gun-Free School Zones Act in 1990 there were 4 school massacres. Since 1990 there were 13 . At least, it indicates that the law is ineffective. At worst, it encourages shootings, by providing safe hunting preserves for every mentally disturbed and morally depraved character bent on murder.
3.In recent mass shooting incidents, the average number of victims when a shooting was stopped by a police was 14.3. On the other hand, when citizens were on hand to stop the shooter, the average number of victims fell to about 2.3 . Police won't be there on time to protect the citizen.
4. The number of multiple-victim shootings in various states dropped by 84%; the number of deaths dropped by 90%, following adoption of concealed handgun laws . Deterrence works.
5.Law abiding gun owners save almost 300,000 lives per year, thus providing a benefit of about $1,000,000,000,000 to the broader society.
Therefore, we urge you to support the following:
1.No new restrictions. At least 4 laws violated in the recent incident failed to stop the shooter; by definition, laws only stop the law-abiding ones.
2.Repeal of the Gun-Free School Zones Act. As recent data show, it is at best useless.
3.Encouragement of a volunteer school protection force by allowing trained and licensed school employees access to self-defense tools. This approach works: Israel, a country at war with a determined opponent, implemented it following Ma'alot massacre and had not have one successful school shooting since 1974.
I am going to add a few personal lines about being an American by choice that won't be applicable to many of the readers, but feel free to re-use or re-write those points.
2.Calculated from http://en.wikipedia.org/wiki/List_of_rampage_killers:_School_massacres
4.Lott, Wall Street Journal, March 27, 1998, available at http://www.fpaulvalone.com/Lott.html