An unknown number of guns are being built with the mechanisms, causing problems for the police and ATF officials. Photo: An ATF agent holds a generic unfinished receiver, back, and one that has been manufactured, front, at an ATF field office in Washington, on May 06, 2014. The ATF is trying to crack down on the trade in the makeshift guns by targeting shops and individuals who offer to turn the unfinished receivers into functional pieces for firearms. (Photo by Bill O'Leary/The Washington Post)

Tyra Banks prepares to pose as she arrives at the iHeartRadio MuchMusic Video Awards (MMVA) in Toronto, Canada, August 26, 2018. (Photo by Mark Blinch/Reuters)

A Wallcreeper (aka Tichodroma muraria) flies to a flower on January 28, 2024 in Leshan, Sichuan Province of China. (Photo by Zhou Zhiyong/VCG via Getty Images)

British fashion model Twiggy plays around on the bumper cars at the Bertram Mills Circus in London, England on January 10, 1967. (Photo by AP Photo)

Competitors take part in the Rude Health World Bog Snorkelling Championships at Waen Rhydd peat bog in Llanwrtyd Wells, Wales on Sunday, August 27, 2023. (Photo by Ben Birchall/PA Images via Getty Images)

People wearing protective face masks amid the coronavirus disease (COVID-19) outbreak are seen near foodstuffs, which are displayed for sale on a car in Omsk, Russia on December 4, 2020. (Photo by Alexey Malgavko/Reuters)

Swedish singer Cornelia Jakobs performs after winning the 2023 Eurovision Song Contest in Liverpool, Britain on May 13, 2023. (Photo by Phil Noble/Reuters)

Waves break against the pier at Tynemouth, on the North East coast, England on March 30, 2020. (Photo by Owen Humphreys/PA Images via Getty Images)