Enough well-written letters can change public policy.
The original name of the first space shuttle was the Constitution in honor of the U.S. Constitution's Bicentennial.
However, the name of OV-101 (the official designation of the first Space Shuttle Orbiter) was changed to Enterprise after then-President Gerald Ford received 100,000 letters from Star Trek fans.
There are an estimated 80 million gun owners in the United States. If even one percent bothered to write in it would yield a letter campaign eight times as massive.