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CHAPTER 2. WHAT ARE “FIREARMS” UNDER THE NFA?

Section 2.1 Types of NFA firearms

The NFA defines the specific types of firearms subject to the provisions of the Act. These definitions

describe the function, design, configuration and/or dimensions that weapons must have to be NFA

firearms. In addition to describing the weapon, some definitions (machinegun, rifle, shotgun, any other

weapon) state that the firearm described also includes a weapon that can be readily restored to fire. A

firearm that can be readily restored to fire is a firearm that in its present condition is incapable of

expelling a projectile by the action of an explosive (or, in the case of a machinegun, will not in its

present condition shoot automatically) but which can be restored to a functional condition by the

replacement of missing or defective component parts. Please be aware that case law is not specific but

courts have held that the “readily restorable” test is satisfied where a firearm can be made capable of

renewed automatic operation, even if it requires some degree of skill and the use of tools and parts.

2.1.1 Shotgun A shotgun is a firearm designed to be fired from the shoulder and designed to use the

energy of the explosive in a fixed shotgun shell to fire through a smooth bore either a number of

projectiles or a single projectile for each pull of the trigger.

A shotgun subject to the NFA has a barrel

or barrels of less than 18 inches in length.

| 15 inches _ |

The ATF procedure for measuring barrel length is to measure from the closed bolt (or breech-face) to

the furthermost end of the barrel or permanently attached muzzle device. Permanent methods of

attachment include full-fusion gas or electric steel-seam welding, high-temperature (1100°F) silver

soldering, or blind pinning with the pin head welded over. Barrels are measured by inserting a dowel rod

into the barrel until the rod stops against the bolt or breech-face. The rod is then marked at the

furthermost end of the barrel or permanently attached muzzle device, withdrawn from the barrel, and

measured.

26 U.S.C. 5845(d)

2.1.2 Weapon made from a shotgun. A weapon made from a shotgun is a shotgun type weapon that

has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length.

| 25 inches _ |

The overall length of a firearm is the distance between the muzzle of the barrel and the rearmost portion

of the weapon measured on a line parallel to the axis of the bore.

2.1.3 Rifle. A rifle is a firearm designed to be fired from the shoulder and designed to use the energy of

an explosive in a fixed cartridge to fire only a single projectile through a rifled barrel for each single pull

of the trigger.

A rifle subject to the NFA has a barrel or barrels of less than 16 inches in length.

| 12 inches ________|

The ATF procedure for measuring barrel length is to measure from the closed bolt (or breech-face) to

the furthermost end of the barrel or permanently attached muzzle device. Permanent methods of

attachment include full-fusion gas or electric steel-seam welding, high-temperature (1100°F) silver

soldering, or blind pinning with the pin head welded over. Barrels are measured by inserting a dowel rod

into the barrel until the rod stops against the bolt or breech-face. The rod is then marked at the

furthermost end of the barrel or permanently attached muzzle device, withdrawn from the barrel, and

measured.

26 U.S.C. 5845(c)

2.1.4 Weapon made from a rifle. A weapon made from a rifle is a rifle type weapon that has an

overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length.

| 18 inches _____________|

The overall length of a firearm is the distance between the muzzle of the barrel and the rearmost portion

of the weapon measured on a line parallel to the axis of the bore.

2.1.5 Any other weapon. Firearms meeting the definition of “any other weapon” are weapons or

devices capable of being concealed on the person from which a shot can be discharged through the

energy of an explosive. Many “any other weapons” are disguised devices such as penguns, cigarette

lighter guns, knife guns, cane guns and umbrella guns.

pengun

knife gun

umbrella gun

Also included in the “any other weapon” definition are pistols and revolvers having smooth bore barrels

designed or redesigned to fire a fixed shotgun shell.

H&R Handy Gun

Ithaca Auto & Burglar Gun

While the above weapons are similar in appearance to weapons made from shotguns, they were

originally manufactured in the illustrated configuration and are not modified from existing shotguns. As

a result, these weapons do not fit within the definition of shotgun

or weapons made from a shotgun

The “any other weapon” definition also includes specifically described weapons with combination

shotgun and rifle barrels 12 inches or more but less than 18 inches in length from which only a single

discharge can be made from either barrel without manual reloading. The firearm most commonly

associated with this portion of the definition is the Marble’s Game Getter.

Marble’s Game Getter

26 U.S.C. 5845(d)

26 U.S.C. 5845(a)(2)

NOTE: One version of the Marble’s Game Getter was produced with 18-inch barrels and a folding

shoulder stock. This model of the Game Getter, as manufactured, is not subject to the provisions of the

NFA because it has barrels that are 18 inches in length and the overall length of the firearm, with stock

extended, is more than 26 inches. However, if the shoulder stock has been removed from the 18-inch

barrel version of the Game Getter, the firearm has an overall length of less than 26 inches and is an

NFA weapon. Specifically, the firearm is classified as a weapon made from a rifle/shotgun.

The “any other weapon” definition excludes weapons designed to be fired from the shoulder that are not

capable of firing fixed ammunition or a pistol or revolver having a rifled bore. However, certain

alterations to a pistol or revolver, such as the addition of a second vertical handgrip, create a weapon that

no longer meets the definition of pistol or revolver.

A pistol or revolver modified as described is an

“any other weapon” subject to the NFA because the weapon is not designed to be fired when held in one

hand.

semiautomatic pistol with second vertical handgrip

As stated above, a pistol or revolver having a rifled bore does not meet the definition of “any other

weapon” and is not subject to the NFA. It is important to note that any pistol or revolver having a barrel

without a rifled bore does not fit within the exclusion and is an “any other weapon” subject to the NFA.

2.1.6 Machinegun. Firearms within the definition of machinegun include weapons that shoot, are

designed to shoot, or can be readily restored to shoot, automatically more than one shot without manual

reloading by a single function of the trigger.

27 CFR 479.11

The definition of machinegun also includes the frame or receiver of a machinegun.

STEN MK II submachinegun

STEN MK II submachinegun receiver

Of all the different firearms defined as NFA weapons, machineguns are the only type where the receiver

of the weapon by itself is an NFA firearm. As a result, it is important that the receiver of a machinegun

be properly identified. Many machineguns incorporate a “split” or “hinged” receiver design so the main

portion of the weapon can be easily separated into upper and lower sections. Additionally, some

machineguns utilize a construction method where the receiver is composed of a number of

subassemblies that are riveted together to form the complete receiver.

The following table lists specific models of machineguns incorporating the above designs and the

portion of the weapon that has been held to be the receiver. This list is not all- inclusive. For

information concerning a split or hinged receiver type machinegun not listed below, contact FTB at

(304) 260-1699.

Model Receiver

Armalite AR10 lower

Armalite AR15 (all variations) lower

Armalite AR18 lower

Beretta AR70 lower

British L1A1 upper

Browning M1917 right side plate

Browning M1919 (all variations) right side plate

Browning M2 & M2HB right side plate

Colt M16 (all variations) lower

Czech Vz 61 lower

FN FNC lower

Model Receiver

FN CAL upper

FN FAL upper

French MAT 49 upper

German MP38 & MP40 upper

H&K G3 (all variations) upper

H&K MP5 (all variations) upper

IMI UZI upper

M61 Vulcan outer housing

M134 Minigun outer housing

Maxim MG08 and 08/15 right side plate

SIG AMT upper

SIG STG 57 upper

SIG 550 Series (all variations) upper

Soviet PPsH 41 upper

Soviet PPS 43 upper

Steyr MPi 69 upper

Steyr MPi 81 upper

Thompson submachinegun (all variations) upper

Vickers water cooled machineguns right side plate

The “designed to shoot automatically more than one shot without manual reloading by a single function

of the trigger” portion of the definition relates to the characteristics of the weapon that permit full

automatic fire. ATF has also held that the “designed” definition includes those weapons which have not

previously functioned as machineguns but possess design features which facilitate full automatic fire by

simple modification or elimination of existing component parts. ATF has published rulings concerning

specific firearms classified as machineguns based on this interpretation of the term “designed.”

Included within the definition of machinegun is any part designed and intended solely and exclusively,

or combination of parts designed and intended, for use in converting a weapon into a machinegun. This

portion of the machinegun definition addresses what are commonly referred to as conversion kits. The

“any part designed and intended solely and exclusively” language refers to a part that was produced for

no other reason than to convert a weapon into a machinegun. Illustrated below are examples of such

parts.

conversion sear for H&K semiautomatic firearms

Appendix B (ATF Rulings 82-2, 82-8, 83-5)

Drop in Auto Sear for AR15 type semiautomatic firearms

The above parts are designed solely and exclusively for use in converting a weapon into a machinegun

and are classified as machineguns.

The “combination of parts designed and intended for use in converting a weapon into a machinegun”

language refers to a group of parts designed and intended to be used in converting a weapon into a

machinegun. A typical example is those M2 carbine parts that are only used to permit fully automatic

fire in a US Carbine M1 or M2.

M2 Carbine conversion kit

The above parts consisting of an M2 selector lever, selector lever spring, disconnector lever assembly,

M2 disconnector, disconnector spring, disconnector plunger and M2 hammer are classified as a

machinegun. These parts are used specifically for fully automatic fire and have no application in a

semiautomatic carbine. While other parts such as an M2 sear, operating slide, trigger housing and stock

are used in the fully automatic carbine, these parts are also appropriate for use in semiautomatic M1

carbines.

Therefore, the M2 sear, operating slide, trigger housing and stock are not a combination of parts

designed and intended for use in converting a weapon into a machinegun. Other commonly encountered

TM9-1267, Cal. .30 Carbines M1, M1A1, M2, and M3, United States Government Printing Office, 1953

conversion kits include modified trigger housings and/or trigger paks for Heckler & Koch (HK) type

semiautomatic firearms. As originally manufactured, semiautomatic HK firearms (HK, 41, 43, 91, 93

and SP89) were specifically designed such that they will not accept fully automatic trigger housings or

trigger paks for HK selective fire weapons such as the G3 and MP5. If selective fire trigger paks or

trigger housings are modified so that they will function with semiautomatic HK firearms, the modified

components are classified as parts designed and intended solely and exclusively, or combination of parts

designed and intended for use in converting a weapon into a machinegun. These modified parts are also

machineguns as defined.

The following illustration shows a selective fire HK trigger pak with a selective fire trigger housing that

has been modified to function with a HK semiautomatic firearm by removing the forward pivot point or

“ears” from the trigger housing.

modified HK selective fire trigger housing

Illustrated below is a selective fire HK trigger pak that has been modified by notching the forward lower

corner of the pak so that it will fit into a standard semiautomatic HK trigger housing.

modified HK selective fire trigger pak

NOTE: standard selective fire HK trigger housings and trigger paks as originally manufactured are

component parts for machineguns. These unmodified parts, in and of themselves, are not subject to the

NFA. However, when adapted to function with a semiautomatic HK firearm the modified parts have

been redesigned and are intended for use in converting a weapon into a machinegun.

The following illustration shows a semiautomatic HK trigger pak with HK conversion sear installed.

HK semiautomatic trigger pak with conversion sear installed

For the conversion sear to function the trigger or the trigger pak must be modified to increase the

rearward travel of the trigger. When the trigger is modified a notch is cut into the trailing leg to provide

more travel before the trigger contacts the upper trigger stop. When the trigger pak is modified, the

upper trigger stop is either removed or relocated. IMPORTANT NOTE: should the conversion sear be

removed from the trigger pak and the modified pak left in the firearm, the weapon will still be capable of

fully automatic fire. Therefore, it is important that registered HK conversion sears be kept with their

respective trigger paks. This is particularly important in instances where HK type firearms are sold as

being “sear ready” or “sear host guns”. If these weapons contain semiautomatic trigger paks modified

to function with conversion sears the firearms are capable of fully automatic fire (without the

conversion sear) and as such are machineguns as defined.

Concerning the installation of conversion kits in semiautomatic firearms, it must be pointed out that the

receiver of the firearm may not be modified to permit fully automatic fire. Such modification results in

the making of a machinegun which is prohibited by 18 U.S.C. 922(o).

The definition of machinegun also includes a combination of parts from which a machinegun can be

assembled if such parts are in the possession or under the control of a person. An example of a firearm

meeting this section of the definition is a semiautomatic AR15 rifle possessed with an M16 bolt carrier,

hammer, trigger, disconnector and selector. If the semiautomatic AR15 is assembled with the described

M16 parts and the rifle is capable of fully automatic fire, the weapon possessed in conjunction with the

M16 parts, whether assembled or not, is a machinegun as defined.

ATF P 5300.4 (9/05), Federal Firearms Regulations Reference Guide – 2005, p. 155

An additional example of a combination of parts from which a machinegun can be assembled is a STEN

submachinegun “parts kit” possessed with a length of metal tube to be used as a replacement receiver

and instructions for assembling the parts into a functional machinegun. The parts kit as sold does not

contain a firearm receiver although remnants of the destroyed receiver may be present. A machinegun

parts kit in this condition is not subject to the GCA or the NFA.

Unfinished receiver tubes with instructions and/or templates for use in the assembly of a functional

machinegun are also commercially available. These tubes with instructions/templates, in and of

themselves, are not subject to the GCA or NFA.

When the parts kit is possessed in conjunction with the above described unfinished receiver tube, a

combination of parts from which a machinegun can be assembled exists and is a machinegun as defined.

2.1.7 Silencer. A firearm silencer and a firearm muffler are defined as any device for silencing,

muffling, or diminishing the report of a portable firearm.

Firearm silencers are generally composed of

an outer tube, internal baffles, a front end cap, and a rear end cap.

complete firearm silencer

The definition of a silencer also includes any combination of parts, designed or redesigned, and intended

for use in assembling or fabricating a firearm silencer or firearm muffler.

The following illustration depicts parts that are designed and intended for use in assembling a firearm

silencer. Another example of parts redesigned and intended for use in assembling or fabricating a

firearm silencer are automotive engine freeze plugs that have been modified by drilling a hole through

their center to permit passage of a bullet.

silencer parts

18 U.S.C. 921(a)(24)

Also included within the silencer definition is any part intended only for use in the assembly or

fabrication of a firearm silencer.

silencer baffle

Any of the above illustrated components meet the definition of a firearm silencer and are subject to the

NFA. NOTE: the language in the definition of silencer contains no provisions that permit an owner of a

registered silencer to possess spare or replacement components for the silencer. However, licensed

manufacturers who are SOTs may possess spare silencer components in conjunction with their

manufacturing operations.

2.1.8 Destructive device. The destructive device definition contains different categories that address

specific types of munitions. Each category describes the devices subject to the definition based on the

material contained in the item, the dimensions of the bore of certain weapons, and a combination of

parts for use in converting the described items into destructive devices.

2.1.8.1 Explosive devices. The first portion of the definition deals with explosive, incendiary

and poison gas munitions. The definition specifies that any explosive, incendiary or poison gas

bomb, grenade, mine or similar device is a destructive device.

explosive bomb

explosive grenade

This portion of the definition includes a rocket having a propellant charge of more than four

ounces and a missile (projectile) having an explosive or incendiary charge of more than one-

quarter ounce.

rocket with more than 4 ounces of propellant

| projectile |

NOTE: Missiles (projectiles) less than caliber 20mm generally are not large enough to

accommodate more than one-quarter ounce of explosive or incendiary material. In the case of

20mm high explosive (HE) or high explosive incendiary (HEI) projectiles, it is imperative to

determine the model designation of the specific item as some 20mm HE and HEI projectiles

contain more than one-quarter ounce of explosive or incendiary material and are destructive

devices. Other 20mm HE and HEI projectiles do not contain more than one-quarter ounce of

explosive and are not destructive devices. Therefore, it is incumbent upon persons interested in

20mm HE and HEI ammunition to determine the amount of explosives contained in a specific

projectile. HE and HEI missiles (projectiles) larger than 20mm generally contain more than one-

quarter ounce of explosive or incendiary material and are destructive devices.

2.1.8.2 Large caliber weapons. The second section of the definition states that any type of

weapon by whatever name known which will, or which may be readily converted to, expel a

projectile by the action of an explosive or other propellant, the barrel or barrels of which have a

bore diameter of more than one-half inch in diameter is a destructive device. This portion of the

definition specifically excludes a shotgun or shotgun shell which the Attorney General finds is

generally recognized as particularly suitable for sporting purposes. ATF has issued rulings

classifying specific shotguns as destructive devices because they have a bore of more than one

half inch in diameter and were found to not be particularly suitable forfor sporting purposes.

The majority of weapons covered by this portion of the destructive device definition are large

caliber military weapons such as rocket launchers, mortars and cannons.

Appendix B (ATF Rulings 94-1, 94-2)

RPG 7 launcher (bore diameter 1.57 inches)

120mm mortar (bore diameter 4.7 inches)

It is important to note that the large caliber firearms covered by this section are defined as

weapons that expel a projectile by the action of an explosive or other propellant. This is the only

place in the GCA and NFA where a propellant other than an explosive must be considered when

classifying a weapon. Examples of weapons having a bore diameter of more than one-half inch

in diameter and that expel a projectile by means other than an explosive are mortars that utilize

compressed air as a propellant and some rocket launchers.

Certain destructive devices may also meet the definition of machinegun because in addition to

having a bore diameter of more than one-half inch the weapons are capable of fully automatic

fire. ATF treats NFA firearms of this type as both machineguns and destructive devices. The

weapons are coded as machineguns in the NFRTR with an annotation that they are also

destructive devices. Any such weapons manufactured on or after May 19, 1986 are subject to 18

U.S.C. 922(o). In instances where a weapon of this type is being transferred, it is imperative that

State and local laws where the weapon is being transferred do not prohibit possession of

destructive devices or machineguns.

M61 20mm full automatic cannon

In addition to defining destructive devices, the definition also specifically excludes certain items

from that classification. As previously stated, any shotgun or shotgun shell which the Attorney

General finds is generally recognized as particularly suitable for sporting purposes is not a

destructive device. Additionally, the following items are also excluded from the definition:

• Any device which is neither designed nor redesigned for use as a weapon.

• Any device, although originally designed for use as a weapon, which is redesigned for

use as a signaling, pyrotechnic, line throwing, safety or similar device.

• Surplus ordnance sold, loaned or given by the Secretary of the Army pursuant to the

provisions of 10 U.S.C. 4684(2), 4685, or 4686.

• Any other device which the Attorney General finds is not likely to be used as a weapon,

or is an antique, or is a rifle which the owner intends to use solely for sporting purposes.

It should not be assumed that any device meeting the above descriptions is automatically

excluded from the definition of a destructive device. ATF has ruled that certain pyrotechnic

devices are destructive devices.

ATF should be contacted to confirm the classification of any

items that appear to meet the above exclusions. Additionally, many of the items excluded from

the definition of destructive device may contain a firearm receiver and would still be a firearm as

defined in the GCA.

2.1.9 Unserviceable firearm. An unserviceable firearm is a firearm that is incapable of discharging a

shot by the action of an explosive and is incapable of being readily restored to a firing condition. The

most common method for rendering a firearm unserviceable, and that recommended by ATF, is to weld

the chamber of the barrel closed and weld the barrel to the receiver.

The chamber of the barrel should

be plug welded closed and all welds should be full fusion, deep penetrating, and gas or electric steel

welds. In instances where the above procedure cannot be employed to render a firearm unserviceable,

FTB should be contacted for alternate methods.

It is important to remember that rendering a firearm unserviceable does not remove it from the definition

of an NFA firearm. An unserviceable NFA firearm is still subject to the import, registration, and

transfer provisions of the NFA. However, there is no tax imposed on the transfer of an unserviceable

Appendix B (ATF Ruling 95-3)

ATF Form 5 (5320.5), Instruction 6a

firearm as a “curio or ornament.” See 26 U.S.C. 5852(e). NOTE: “curio or ornament” is only

descriptive of unserviceable firearms transferred exempt from transfer tax. An unserviceable firearm

transferred as a “curio or ornament” is not necessarily a “curio or relic” firearm for purposes of the

GCA unless the weapon is classified as a curio or relic under the GCA. For further information on curio

or relic classification see section 2.2.

Section 2.2 Antique firearm. Firearms defined by the NFA as “antique firearms” are not subject to

any controls under the NFA.

The NFA defines antique firearms based on their date of manufacture

and the type of ignition system used to fire a projectile. Any firearm manufactured in or before 1898

that is not designed or redesigned for using rimfire or conventional center fire ignition with fixed

ammunition is an antique firearm. Additionally, any firearm using a matchlock, flintlock, percussion

cap or similar type ignition system, irrespective of the actual date of manufacture of the firearm, is also

an antique firearm.

NFA firearms using fixed ammunition are antique firearms only if the weapon was actually

manufactured in or before 1898 and the ammunition for the firearm is no longer manufactured in the

United States and is not readily available in the ordinary channels of commercial trade. To qualify as an

antique firearm, a fixed cartridge firing NFA weapon must meet both the age and ammunition

availability standards of the definition.

Concerning ammunition availability, it is important to note that a specific type of fixed ammunition that

has been out of production for many years may again become available due to increasing interest in

older firearms. Therefore, the classification of a specific NFA firearm as an antique can change if

ammunition for the weapon becomes readily available in the ordinary channels of commercial trade.

Section 2.3 Curios or relics. Curios or relics are firearms that are of special interest to collectors.

NFA firearms can be classified as curios or relics under the same criteria used to classify conventional

firearms as curios or relics.

An NFA firearm that is recognized as a curio or relic is still an NFA “firearm” and is still subject to the

registration and transfer provisions of the NFA. The primary impact of a curio or relic classification is

that a properly registered NFA firearm classified as a curio or relic may be lawfully transferred interstate

to, or received interstate by, a person licensed as a collector of curios or relics under the GCA.

Section 2.4 Applications to remove firearms from the scope of the NFA as collector’s items.

Certain NFA weapons can be removed from the provisions of the NFA as collector’s items.

The

procedures for requesting removal of an NFA firearm are the same as used for requesting a destructive

device determination.

26 U.S.C. 5845(a), (g)

27 CFR 478.11

27 CFR 478.26

26 U.S.C. 5845(a)

27 CFR 479.24 - 479.25

An NFA firearm removed from the NFA as a collector’s item is no longer subject to any of the

provisions of the NFA. In most cases, the weapon will still be a firearm as defined in the GCA and

subject to regulation under the GCA. In some situations, the weapon that is removed from the NFA as a

collector’s item will be an antique firearm as defined in the GCA.

In these instances, the weapon

would no longer be a firearm as defined in Federal law.

The Attorney General does not have the authority to remove a machinegun or a destructive device from

the provisions of the NFA as collector’s items.

Therefore, applications to remove machineguns or

destructive devices from the NFA as collector’s items cannot be approved.

Section 2.5 Removal of firearms from the scope of the NFA by modification/elimination of

components.

Firearms, except machineguns and silencers, that are subject to the NFA fall within the various

definitions due to specific features. If the particular feature that causes a firearm to be regulated by the

NFA is eliminated or modified, the resulting weapon is no longer an NFA weapon.

For example, a shotgun with a barrel length of 15 inches is an NFA weapon. If the 15- inch barrel is

removed and disposed of, the remaining firearm is not subject to the NFA because it has no barrel.

Likewise, if the 15 inch barrel is modified by permanently attaching an extension such that the barrel

length is at least 18 inches and the overall length of the weapon is at least 26 inches, the modified

firearm is not subject to the NFA. NOTE: an acceptable method for permanently installing a barrel

extension is by gas or electric steel seam welding or the use of high temperature silver solder having a

flow point of 1100 degrees Fahrenheit.

A shot pistol (“any other weapon”) such as an H&R Handy Gun may be removed from the NFA by

either disposing of the smooth bore barrel or permanently installing a rifled sleeve chambered to accept

a standard pistol cartridge into the smooth bore barrel. Modified by sleeving the barrel, an H&R Handy

Gun is no longer an NFA weapon because it now has a rifled bore.

Large caliber destructive devices that are not also machineguns can be removed from the NFA by

disposing of the barrel. If the barrel of a 37mm cannon is removed and disposed of, the remaining

weapon has no barrel or bore diameter. As an alternative, the barrel of a destructive device may be

functionally destroyed. To destroy the barrel of a destructive device the following operations must be

performed:

• Cut a hole, equal to the diameter of the bore, on a 90-degree angle to the axis of the bore,

through one side of the barrel in the high pressure (chamber) area.

• Weld the barrel to the receiver of the weapon.

• Weld an obstruction into the barrel to prevent the introduction of a round of ammunition.

2.5.1 Removal of machineguns and silencers from the scope of the NFA. Machineguns are defined

to include the receiver of a machinegun and the definition of silencer includes each component of a

18 U.S.C. 921(a)(16)

26 U.S.C. 5845(a)

silencer. Therefore, to remove these weapons from the provisions of the NFA, the receiver of a

machinegun or all the components of a silencer must be destroyed.

The preferred method for destroying a machinegun receiver is to completely sever the receiver in

specified locations by means of a cutting torch that displaces at least one-quarter inch of material at each

cut location. ATF has published rulings concerning the preferred destruction of specific machineguns.

A machinegun receiver may also be properly destroyed by means of saw cutting and disposing of certain

removed portions of the receiver. To ensure that the proposed saw cutting of a particular machinegun

receiver is acceptable, FTB should be contacted for guidance and approval of any alternative destruction

proposal. Note: a machinegun receiver that is not properly destroyed may still be classified as a

machinegun, particularly in instances where the improperly destroyed receiver is possessed in

conjunction with other component parts for the weapon.

A silencer may be destroyed by completely severing each component by means of a cutting torch that

has a tip of sufficient size to displace at least one-quarter inch of material at each cut location.

Concerning the outer tube(s) of a silencer, these components may be destroyed by crushing them flat in

lieu of cutting with a torch.

Anyone interested in destroying an NFA weapon by means other than described above should contact

FTB to discuss possible alternatives.

Appendix B (ATF Rulings 2003-1, 2003-2, 2003-3, 2003-4)