If you were to run down a list of hot-button issues which inflame the electorate on both sides, gun control would be near the top. The majority of the population favors stricter laws according to most polls, but those who are against new restrictions are much more vocal. Only 10% of the population favors weakening restrictions.
Given this, it may come as a surprise that in recent years laws regulating gun sales and ownership have become considerably less restrictive. This is due to a combination of reasons that start with a large Republican control of 30 state legislatures. Ultimately, however, the main driving force is a Supreme Court ruling which stated that the Second Amendment deals with individual, not militia rights.