Authorities said shooting suspect Ahmad Al Aliwi Alissa purchased an AR-15 style gun used in the mass shooting six days before Monday’s fatal shootings.
The FBI conducted more than 4.3 million firearm background checks last month as political tumult and transition took hold.
Gun safety advocates expressed concern about the new data, which coincides with reports of record sales from firearm retailers across the country.
The FBI conducted about 2.9 million checks in April, a sign that coronavirus concerns are prompting record-breaking gun sales.
The number marks a 41% increase from the same period last year, another indicator of massive gun sales amid the coronavirus pandemic.
It may go nowhere because President Donald Trump hasn't signed off on it yet.
Democrats have long contended their support for gun control laws doesn't mean they want to take away law-abiding citizen's firearms.
The president is expected to be briefed on potential gun control proposals this week.
Presumably, Gov. Greg Abbott knows that most private gun sales in Texas don't require background checks.
President Trump's contradictory statements on gun policy this month have been confusing — but his stance has fluctuated many times in the last 20 years.