Two Democratic lawmakers on Monday will announce new legislation to regulate the online and mail-order sale of ammunition.

Sen. Frank Lautenberg (N.J.) and Rep. Carolyn McCarthy (N.Y.) said the new law would make the sale of ammunition “safer for law-abiding Americans who are sick and tired of the ease with which criminals can now anonymously stockpile for mass murder,” in a statement released Saturday.

The lawmakers cite the recent movie massacre in Aurora, Colo. for spurring their bill.