Updated Oct. 31 at 12:35 p.m. | In the wake of the Oct. 1 Las Vegas shooting — the deadliest in U.S. history — lawmakers from both parties were quick to call for a review of the bump stock attachments found on 12 of the rifles in the gunman’s hotel room.

Most lawmakers have signaled they support more strictly regulating the devices. But GOP and Democratic leaders diverge on whether the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) already has the authority under current gun laws to regulate them.

Republican leaders say the bureau does. Democrats — and some moderate Republicans — say it doesn’t, and have introduced three new pieces of legislation to provide the ATF with legal avenues to regulation.

Roll Call tracked down each member’s position on bump stocks, which you can search below.

[Bipartisan Group Introduces Last-Ditch Bump Stock Bill]