I 
119TH CONGRESS 
1ST SESSION H. R. 4257 
To amend title 18, United States Code, to provide increased penalties for 
mass killings involving machineguns or certain semiautomatic weapons, 
and for other purposes. 
IN THE HOUSE OF REPRESENTATIVES 
JUNE 30, 2025 
Mr. MOULTON (for himself and Ms. ESCOBAR) introduced the following bill; 
which was referred to the Committee on the Judiciary 
A BILL 
To amend title 18, United States Code, to provide increased 
penalties for mass killings involving machineguns or cer-
tain semiautomatic weapons, and for other purposes. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘End Domestic Ter-
rorism Act’’. 
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SEC. 2. MASS KILLINGS USING MACHINEGUNS OR COVERED 
SEMIAUTOMATIC WEAPONS. 
(a) IN GENERAL.—Chapter 113B of title 18, United 
States Code, is amended by inserting after section 2332i 
the following: 
‘‘§ 2332j. Mass killings using machineguns or covered 
semiautomatic weapons 
‘‘(a) Whoever kills 3 or more people in a single inci-
dent using a machinegun, a destructive device, or a cov-
ered semiautomatic weapon in a circumstance described 
in subsection (b) and at a location described in subsection 
(c), shall be imprisoned for any term of years or for life. 
‘‘(b) A circumstance described in this subsection is 
any one of the following: 
‘‘(1) The mail or any facility of interstate or 
foreign commerce was used in furtherance of the of-
fense. 
‘‘(2) The machinegun or covered semiautomatic 
weapon used in the commission of the offense was 
transported in interstate or foreign commerce. 
‘‘(3) The perpetrator traveled in or caused an-
other to travel in interstate or foreign commerce in 
furtherance of the offense. 
‘‘(4) The offense occurred within the special 
maritime and territorial jurisdiction of the United 
States. 
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‘‘(5) The offense otherwise occurred in or af-
fected interstate or foreign commerce. 
‘‘(c) A location described in this subsection is any one 
of the following: 
‘‘(1) A school or location of a school-sponsored 
activity or organization. 
‘‘(2) A place of worship. 
‘‘(3) A medical facility or care facility. 
‘‘(4) A childcare facility. 
‘‘(5) A government building, including a Fed-
eral building, a municipal building, and a court-
house, or a voting location. 
‘‘(6) An entertainment or educational venue or 
facility, including a concert venue, a professional 
sporting event, a museum, a library, a movie the-
ater, a theater venue, an arcade, a bowling alley, or 
an amusement park. 
‘‘(7) A scheduled public event, such as a pa-
rade, a ceremony, or a race. 
‘‘(8) A retail location, including a mall, a gro-
cery store, a convenience store, a bar, or a res-
taurant. 
‘‘(9) An office building.’’. 
(b) DEFINITION.—Section 2331 of chapter 113B is 
amended— 
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(1) in paragraph (5), by striking ‘‘and’’ at the 
end; 
(2) in paragraph (6), by striking the period at 
the end and inserting a semicolon; and 
(3) by adding at the end the following: 
‘‘(7) the term ‘covered semiautomatic weapon’ 
means— 
‘‘(A) semiautomatic rifle that— 
‘‘(i) has a magazine that is not a fixed 
magazine; and 
‘‘(ii) does have any one of— 
‘‘(I) a pistol grip; 
‘‘(II) a forward grip; 
‘‘(III) a folding, telescoping, or 
detachable stock, or is otherwise 
foldable or adjustable in a manner 
that operates to reduce the length, 
size, or any other dimension, or other-
wise enhances the concealability, of 
the weapon; 
‘‘(IV) a grenade launcher; 
‘‘(V) a barrel shroud; or 
‘‘(VI) a threaded barrel; 
‘‘(B) a semiautomatic rifle that has a fixed 
magazine with the capacity to accept more than 
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10 rounds, except for an attached tubular de-
vice designed to accept, and capable of oper-
ating only with, .22 caliber rimfire ammunition; 
‘‘(C) any part, combination of parts, com-
ponent, device, attachment, or accessory that is 
designed or functions to accelerate the rate of 
fire of a semiautomatic firearm but not convert 
the semiautomatic firearm into a machinegun; 
‘‘(D) a semiautomatic shotgun that— 
‘‘(i) has the capacity to utilize a mag-
azine that is not a fixed magazine; and 
‘‘(ii) does have any one of— 
‘‘(I) a folding, telescoping, or de-
tachable stock; 
‘‘(II) a pistol grip or bird’s head 
grip; 
‘‘(III) a fixed magazine with the 
capacity to accept more than 5 
rounds; 
‘‘(IV) the ability to accept a de-
tachable magazine; 
‘‘(V) a forward grip; or 
‘‘(VI) a grenade launcher; 
‘‘(E) any AK or AR type of weapon, in-
cluding a rifle, copy, duplicate, variant, or al-
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tered facsimile with the capability of any such 
weapon; and 
‘‘(F) any weapon that is substantially simi-
lar to a weapon described in subparagraphs (A) 
through (E) determined by the Attorney Gen-
eral pursuant to a rule, which shall be made on 
the record after opportunity for a hearing pur-
suant to the rulemaking procedures prescribed 
by subchapter II of chapter 5 of title 5; 
‘‘(8) the term ‘machinegun’ has the meaning 
given such term in section 5845(b) of the Internal 
Revenue Code of 1986; and 
‘‘(9) the term ‘destructive device’ has the mean-
ing given such term in section 921.’’. 
(c) 
PROVIDING
MATERIAL
SUPPORT.—Section 
2339A(a) of title 18, United States Code, is amended by 
inserting after ‘‘2332f,’’ the following: ‘‘2332j,’’. 
(d) CLERICAL AMENDMENT.—The table of sections 
for chapter 113B of title 18, United States Code, is 
amended by inserting after the item related to section 
2332i the following: 
‘‘2332j. Mass killings using machineguns or covered semiautomatic weapons.’’. 
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SEC. 3. REPORT ON CHARGES FILED FOR USE OF WEAPONS 
OF MASS DESTRUCTION AND PROVIDING MA-
TERIAL SUPPORT TO TERRORISTS. 
On the date that is one year after the date of enact-
ment of this Act, and annually thereafter, the Attorney 
General shall submit to Congress a report on each case 
in which the Department of Justice has filed charges 
under section 2332j or 2339a of title 18, United States 
Code, during the previous year, which shall include the 
following: 
(1) For each case in which charges under sec-
tion 2332j of title 18, United States Code, were 
filed— 
(A) the date of the alleged offense; 
(B) the number of individuals who were in-
jured; 
(C) the number of fatalities; 
(D) the age, gender, race, ethnicity, and 
nationality of each individual charged under 
such section; and 
(E) the weapon used in the alleged offense. 
(2) For each case in which charges under sec-
tion 2339a of title 18, United States Code, were 
filed— 
(A) the type of support alleged to have 
been provided; 
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(B) to whom such support was alleged to 
have been provided; and 
(C) the age, gender, race, ethnicity, and 
nationality of each individual charged under 
such section. 
SEC. 4. INCLUSION OF DEMOGRAPHIC INFORMATION IN 
REPORTS CONCERNING INTERCEPTED WIRE, 
ORAL, OR ELECTRONIC COMMUNICATIONS. 
Section 2519(2)(c) of title 18, United States Code, 
is amended by inserting after ‘‘order or extension,’’ the 
following: ‘‘, the age, gender, race, ethnicity, and nation-
ality of each individual arrested,’’. 
SEC. 5. PUBLIC REPORTING REQUIREMENT. 
Not later than 180 days after the Department of Jus-
tice files charges under section 2332j of title 18, United 
States Code, the Attorney General shall make publicly 
available on the website of the Department of Justice a 
report, which shall include the following: 
(1) The number of individuals present at the lo-
cation of the offense. 
(2) Total amount expended by Federal, State, 
and local governments in response to the offense, in-
cluding law enforcement response, reimbursement 
for medical expenses, the provision of mental health 
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services, and support provided to affected busi-
nesses. 
(3) Total amount of lost business revenue as a 
result of the offense. 
(4) The total amount of assistance provided as 
a result of the offense through compensation and as-
sistance programs, such as the Crime Victims Fund. 
Æ 
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