Political spending by gun rights groups far outweighs that by gun control groups. Here, we break down just how wide the discrepancy is.

We define gun rights groups as non-profit organizations that lobby Congress and advocate on behalf of the ownership and use of firearms, and we define gun control groups as non-profit organizations that lobby Congress and advocate for gun control legislation. (Where relevant, we've also included donations from super PACs where gun control policy is a major focus.)

We've honed in on the largest and most prominent of these special interest groups. See how their spending breaks down