Law enforcement sources indicate Capital Gazette shooting suspect Jarrod Ramos used a pump shotgun that was legally purchased.

Breitbart News reported that Ramos allegedly opened fire on Capital Gazette employees around 3 p.m. Thursday, killing 5. He was apprehended by police without incident, but refused to corporate once in their custody.

A shotgun was recovered at the scene.

ABC7 reports that Anne Arundel County Police Chief Timothy Altomare said Ramos purchased the shotgun “about a year ago.”

This means Ramos is but the latest in a long list of public attackers to acquire his firearm via a background check. In fact, it is harder to name a mass attacker who did not acquire guns via a background check than to name one who did.

Here is a list of recent attackers who acquired their guns via a background check:

Yet Sen. Chris Murphy (D-CT) claims background checks are the “north star” in the Democrats’ pursuit of gun control.

AWR Hawkins is an award-winning Second Amendment columnist for Breitbart News, the host of the Breitbart podcast Bullets with AWR Hawkins, and the writer/curator of Down Range with AWR Hawkins, a weekly newsletter focused on all things Second Amendment, also for Breitbart News. He is the political analyst for Armed American Radio. Follow him on Twitter: @AWRHawkins. Reach him directly at awrhawkins@breitbart.com. Sign up to get Down Range at breitbart.com/downrange.