For years, the highlight on 3D printing’s potential for firearm manufacturing has revolved round absolutely 3D printed weapons. Nonetheless, the eye has now shifted to a much smaller, cheaper, and probably extra deadly mechanism: the machine gun conversion machine (MCD). These tiny, typically 3D printed elements have gotten thought of a extra severe threats, based on authorities. Straightforward to fabricate and unlawful for many years, MCDs can flip a semi-automatic firearm into a completely automated weapon—delivering tons of of rounds with a single pull of the set off. This rising pattern has prompted the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and the U.S. Division of Justice to take fast motion.

A swap “claiming” to be a Glock swap, however in actuality, Glock by no means manufactured switches. Picture courtesy of the U.S. Lawyer’s Workplace.
The Rise of MCDs
MCDs, also referred to as “switches” or “auto sears,” are small elements—often comprised of steel or plastic—that may be simply hooked up to a handgun or rifle to transform it from semi-automatic to completely automated. Whereas possessing or manufacturing MCDs is prohibited within the U.S., their manufacturing has exploded within the final two years, largely as a result of it is extremely straightforward to create them with 3D printers, and they’re typically bought on-line or printed at residence.
Based on authorities, these gadgets are actually changing into essentially the most often recovered unlawful firearm modification within the U.S. The ATF says there was a 570% improve in MCD recoveries over the previous decade.
Recognizing the rising menace, federal authorities, together with U.S. Deputy Lawyer Common Lisa Monaco and ATF Director Steven Dettelbach, held a essential assembly on September 6, 2024. The occasion, which featured opening remarks by Monaco, Dettelbach, and U.S. Lawyer Christopher Kavanaugh, introduced collectively members of the additive manufacturing trade, academia (together with Dartmouth School and Wichita State College), Oak Ridge Nationwide Lab, and regulation enforcement to handle the rising risks of MCDs.
Although a lot of the assembly was held behind closed doorways, the general public portion pointed to the necessity for collaboration to forestall the misuse of 3D printing know-how to make MCDs. Though the representatives from the 3D printing trade weren’t named, Monaco acknowledged their presence.
“Technological developments gives great optimistic worth to our nation, however it’s its misuse that we’re right here immediately to attempt to get a deal with on,” stated Dettelbach. “A long time in the past, Congress banned, besides in very restricted circumstances, new machine weapons, and if you happen to had instructed people in regulation enforcement that in 2024, machine weapons could be a significant menace to public security, I believe they’d have rolled their eyes at you in disbelief. But right here we’re on this room, and in all places I am going across the nation, I discuss to regulation enforcement, I hearken to them, they usually all inform me the identical factor: that pounding repetitive sound of automated weapon fireplace has hit the streets of this nation like jackhammers, and it has shattered so many lives.”
A Temporary Historical past
Machine gun conversion gadgets aren’t new; they’ve been unlawful for the reason that Firearm House owners Safety Act (FOPA) of 1986. The act made it unlawful for civilians to own or manufacture machine weapons or elements, besides in extremely regulated instances. Previously, MCDs had been troublesome to get and primarily discovered within the fingers of organized legal teams. Nonetheless, with the rise of reasonably priced and accessible 3D printing, these once-rare gadgets are actually simpler to provide, resulting in a spike of their use throughout numerous states linked to violent crimes and gang exercise.
Whereas the best to bear arms stays protected underneath the Second Modification, using MCDs presents a novel potential hazard to public security, identified Dettelbach. So whereas proudly owning firearms, together with semi-automatic weapons, continues to be authorized within the U.S. underneath federal regulation, the second a firearm is modified with an MCD, it turns into a machine gun, making its possession, sale, or manufacturing a severe felony with penalties together with as much as 10 years in jail and a $250,000 fantastic.
Throughout shootings the place MCDs are used, the variety of rounds fired and fatalities typically spikes, turning easy road incidents into mass capturing scenes, explains Monaco. This has led each federal regulation enforcement and native police departments to make MCDs a precedence.
Authorities Response
Recognizing the rising hazard of MCDs, the Justice Division has launched three initiatives to fight the unfold of those unlawful gadgets. Most notably, Monaco introduced the creation of the ANTI-MCD (Motion Community to Terminate Unlawful MCDs) job power, co-chaired by the ATF and U.S. Attorneys. The initiative will increase monitoring, prosecution, and regulation enforcement coaching on figuring out and combating MCD offenses.
As well as, the Justice Division is specializing in ramping up prosecutions of MCD violations throughout the nation.
“I’m directing all 94 U.S. Attorneys’ Places of work to prioritize MCD prosecutions by using complete and district-specific MCD enforcement methods,” stated Monaco. “Over the subsequent 90 days, every U.S. Lawyer’s workplace will meet with federal, state, native, Tribal, and territorial regulation enforcement companions to determine promising MCD-related enforcement practices. Many U.S. Attorneys are already doing this.”
Lastly, the ATF has rolled out the Nationwide MCD Coaching Initiative to assist regulation enforcement officers and prosecutors study concerning the fast-changing designs of MCDs, a lot of that are being shared in on-line 3D printing communities. This coaching shall be usually up to date to verify the ATF and native police keep forward of the criminals making these gadgets.
One instance of the federal government’s response comes from Mission Change Off, a program launched in Oklahoma Metropolis that has led to just about 40 prosecutions in lower than a 12 months. The challenge consists of coaching almost 500 native law enforcement officials to determine MCDs and prosecute people concerned of their use.
Regulation enforcement efforts are beginning to present outcomes. As one police officer in Oklahoma Metropolis reported to Monaco, “Gang members are scared to dying to make use of the switches as a result of their buddies are going to federal jail.” This shift in legal conduct is “a robust instance of how working collectively we will make a distinction for our communities,” went on to say Monaco to attendees.
Whereas native efforts like Mission Change Off are making strides, the federal authorities can also be tackling the difficulty at a bigger scale. In a significant effort to disrupt the unlawful distribution of machine gun conversion gadgets, federal authorities lately seized over 350 web site domains that had been getting used to import MCDs and silencers from China. These gadgets had been typically mislabeled as “toys” or “necklaces” to evade detection. The importation of MCDs and silencers from abroad not solely violates the Nationwide Firearms Act however reveals how the issue is changing into extra worldwide, and authorities have concluded that as MCDs proceed to extend, the stakes have by no means been greater.

One of many greater than 350 web sites seized by Federal authorities used to import unlawful switches from China. Picture courtesy of the U.S. Lawyer’s Workplace.
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