WASHINGTON — Semi-automatic weapons, flamethrowers and even some grenades will become easier for U.S. weapons manufacturers to export overseas under new rules being put in place by the Trump administration and obtained by NBC News.

Under the new rules, set to take effect in just under a month, gun-makers will no longer need licenses from the Department of State to sell dozens of types of weapons to other countries, including semi-automatic assault weapons such as the AR-15 that has been employed in many of America’s worst mass shootings. Instead, sellers will need only a no-fee license from the Department of Commerce, which has a less onerous licensing process and a smaller global footprint, making it harder to track how the weapons are ultimately used overseas.

The new rules come as efforts to strengthen gun control in the United States, a key priority in the Obama administration, have stalled under President Donald Trump despite continued mass shootings. Democrats have signaled they plan to use their newfound control of the House of Representatives to revisit the issue, starting with a House Judiciary Committee hearing held Wednesday — the first in about eight years.

The Trump administration first floated the changes last year, rejuvenating a campaign to simplify export rules that had been contemplated by the administration of President Barack Obama but then dropped after the mass shooting at the Sandy Hook Elementary School in Newtown, Connecticut in 2012. The State Department sent the final version of the rules to key lawmakers Monday as part of the mandatory “congressional notification” process. The rules will take effect 30 days later unless Congress takes the unlikely step of passing a resolution to block them.

A copy of the new regulations, marked “Only for State internal use,” says that supervision for exports of any semi-automatic firearms that don’t use caseless ammunition will move from the State Department to the Commerce Department. The same applies to shotguns, other than those that are fully automatic.

Those who want to export flamethrowers that project a stream of fire up to 20 meters (about 66 feet) will no longer need a State Department license. A new paragraph in the rules states that grenades, too, will now fall under the Commerce Department if they contain “non-lethal or less lethal projectiles.” Most parts, components and ammunition for firearms are also being moved to the Commerce Department.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

Part of Trump’s push to reduce regulations governmentwide, the new rules aim to assist American gun manufacturers by making it simpler to export products that the administration says are already “widely available for retail sale in the United States.” Exports of weapons deemed to have an “inherently military function” or to provide the U.S. with a military advantage will remain controlled by the State Department.

But gun control advocates and many Democrats have voiced concerns about the proliferation of weapons in places where, unlike the United States, deadly weapons aren’t readily available at sporting goods stores or retailers like Walmart.

“In most countries, it is much more difficult to obtain any kind of firearm, much less a semi-automatic rifle or a flamethrower,” said John Lindsay-Poland, a gun trafficking expert at the human rights group Global Exchange. “In a context where such weapons aren’t available to ordinary people, they become weapons of war, whether we’re talking about insurgencies or terrorist organizations or organized crime. They use those weapons to control territory, carry out acts against civilians and to contest state power.”

The changes also mean that sales of less than $1 million in arms will not require advance notification to Congress, which allows lawmakers a period of time to block a potential sale. That process has in the past been used to stop sales of firearms to countries of concern.

In 2017, opposition from lawmakers thwarted a Trump administration proposal to let Turkish President Recep Tayyip Erdogan’s bodyguards buy $1.2 million in U.S. guns, following violence against protesters during his visit to Washington, D.C. A similar process stopped the U.S. from selling tens of thousands of assault weapons to the Philippines’ national police in 2016.

Under the new rules, exporting guns will also cost less. Unlike the State Department, which charges an annual $2,240 fee for licenses to export firearms, the Commerce Department's licensing process doesn’t require a fee.

Although some Democratic opposition is expected to the new rules, they are likely to take effect anyway. New Jersey Sen. Robert Menendez, the top Democrat on the Senate’s foreign relations panel, plans to put a hold on the rules, The New York Times has reported. But to block the rules permanently, Congress would have to pass a resolution disapproving them, a maneuver that has been rarely attempted and even less frequently successful.

A State Department official, speaking anonymously because the final rules haven’t been publicly released, stressed that all firearm exports will still be monitored by the U.S. government, via the Commerce Department.

The official said the changes would “significantly reduce the regulatory burden on the U.S. commercial firearms and ammunition industry, promote American exports, and clarify the regulatory requirements for independent gunsmiths, while at the same time prioritizing national security controls and continuing our ability to restrict exports where human rights, illicit trafficking, and related issues may be of concern.”

In public comments submitted to the Federal Register after the Trump administration first proposed the rules in May, the National Rifle Association voiced its support, arguing that the Commerce Department is fully capable of regulating gun exports.

Still, the Institute for Legislative Action — the gun group’s lobbying arm — encouraged the administration to tweak the rules by removing even more categories of items from the State Department’s control, including silencers and high-capacity magazines.

“The NRA believes that, on the whole, the proposal correctly balances the imperatives of national and global security, allocation of oversight resources, and promotion of American industry, innovation, and competiveness,” Christopher Zealand, the group’s senior research attorney. wrote.

Yet many of the almost 3,000 comments received by the government argued against the easing of the export rules, warning of the risk of increasing gun trafficking and needlessly enriching the gun manufacturing industry.

“To cite just a few reasons, it will make it easier for dictators, organized crime, and terrorists to obtain guns in large quantities,” one of them, Marilyn Guterman, commented. “Please, in the name of peace and sanity do not allow this to happen.”