II 118th CONGRESS 1st Session S. 1909 IN THE SENATE OF THE UNITED STATES June 8, 2023 Mr. Heinrich (for himself, Ms. Collins , and Ms. Cortez Masto ) introduced the following bill; which was read twice and referred to the Committee on the Judiciary A BILL To amend title 18, United States Code, to prohibit the illegal modification of firearms, and for other purposes.