The correct answer to this open question is the following.
One reason a legislator may agree with the issue that H.R. 3999
addresses is to try to support a piece of legislation to control the sale of guns in the United States.
H.R. 3999 is an amendment to federal criminal code prohibits the manufacture, possession, or trade of semiautomatic rifles in the United States. This legislation does not authorize a citizen to do so. If it violates the law, the citizen can be fined or sent to prison.
This legislation was created to establish a stricter control on guns in America, after so many terrible incidents of shooting in public schools and public places.
