WASHINGTON — American gun manufacturers and their allies have pressed the federal government for years to change the way it regulates small-arms exports in an effort to ease restrictions, boost gun sales abroad and lower costs at home. The Trump administration appears to be on the brink of delivering.

Officials from the State and Commerce Departments — the two entities tasked with regulating arms sales internationally — privately told Congress this week that they intend to finalize rules next week that would shuffle which agency oversees most consumer gun exports, relaxing export regulations and oversight, according to congressional aides familiar with the plans. Once Congress receives formal notification of the rule change, lawmakers will have 30 days to decide whether to intervene or let the new rules take effect.

Under the changes, many American gun and ammunition manufacturers that sell primarily to consumers would no longer be required to register with the State Department, which currently licenses international arms sales, or to pay the department an annual fee. Instead, those sales would be licensed by the Commerce Department, which has a simpler process and does not charge a fee.

The changes are almost certain to provoke resistance from some Democratic lawmakers, who fear that lighter regulation will lead to a proliferation of American guns, including AR-15s and similar semiautomatic rifles frequently used in mass shootings, around the world and exacerbate illegal arms trafficking. Senator Robert Menendez of New Jersey, the top Democrat on the Senate Foreign Relations Committee, has such strong concerns that he plans to place a hold on the new rule — a step that his staff believes could effectively bar it being carried out for a period of time to allow for negotiations over his objections.