On Monday the ATF revealed that Jacksonville gunman David Katz had two handguns at the time of his attack and he acquired both of those legally in Baltimore, Maryland.

ABC News reports that Jacksonville Sheriff Michael Williams said Katz was armed with two handguns — a .45 caliber and a 9mm, when he opened fire on fellow gamers at the Madden Tournament. However, Williams added that Katz only used one of the guns in the attack.

The ATF revealed that Katz bought both guns “within the month of August in Baltimore from a licensed dealer.” This means Katz passed a background check to acquire his firearms, and it also means he complied with pre-purchase requirements for would-be handgun purchasers in Maryland.

Katz now joins a growing list of public attackers who have acquired their guns via background checks. That list includes:

Following news of the Jacksonville shooting, but before all the facts were in, gun control proponent David Hogg took to Twitter to urge Congress to require background checks on all gun sales:

Jacksonville is a yet another reason to oppose expanding background checks, inasmuch as it is demonstrable that such checks pose no hindrance to would-be criminals. They simply create more red tape for law-abiding citizens to wade through in order to acquire guns for self-defense.

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.