The National Rifle Association and its allies have found their political influence under fresh scrutiny as gun control advocates push for new restrictions and corporations sever their ties in the wake of the deadly high school shooting last month in Parkland, Florida. But outside the gun control debate in Washington, membership in the NRA and gun rights groups across the country, which includes more than five million Americans, is spiking, according to people familiar with the numbers.

The spike isn’t a surprise, as such increases happen whenever people feel their Second Amendment rights are under threat, and many groups reported similar surges after the 2012 shooting at Sandy Hook Elementary School in Newtown, Connecticut. But as gun control groups seek to use the anti-NRA backlash to mobilize their grassroots, recruitment this time seems to have taken on a more urgent tone.

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