Jeffrey K. Salkin,Religion News Service
What does Judaism say about guns or, to be more accurate, and about any dangerous weapon or situation?The Torah is not terribly helpful here other than the mitzvah (commandment) of making certain that the roof of your house has a parapet in order to prevent someone from falling off (Deuteronomy 22:8). In other words,you have to form certain that you achieve all that you can to eliminate household dangers.
Neither are the books of the prophets terribly helpful other than the good venerable (respected because of age, distinguished) messianic beat their swords into plowshares and spears into pruning hooks thing, which would seem to endorse...
Source: realclearreligion.org