Posted on: October 16, 2023 Posted by: Prosolventtrap Comments: 0

After determining your preferred method for constructing a solvent trap suppressor, the next step involves completing the necessary documentation with the Bureau of Alcohol, Tobacco, and Firearms. Specifically, you’ll be dealing with Form 1: Application for Manufacturing and Registering a Firearm. It’s worth noting that, until recently, this paperwork required manual completion and submission through postal mail. However, the ATF now offers the option to digitally submit your application. We will guide you through the entire process to ensure a smooth application submission for your suppressor.

1. The ATF E-Forms WebsiteATF eforms website

First, navigate to the E-Forms website: https://eforms.atf.gov/EForms/

2. Register an Account

Towards the lower part of the page, you’ll find a button labeled “Register.” Simply click on it to access the account registration page.:

Register an Account
  1. Provide your first and last name, and if applicable, include your middle initial.
  2. The “Title” section can remain empty; only the fields marked with an asterisk (*) are obligatory.
  3. Input your email, county, and home of record. You can skip the “+4” section of the ZIP code.
  4. For those residing in an apartment or condo, utilize Address Line 2 for the apartment or building number.
  5. The User ID will be automatically generated, and customization is not an option.
  6. Enter a password, along with a secret question and its answer, and conclude with the last four digits of your social security number.
  7. Complete the process by clicking on the “Register” button.
Click Register


After completing the registration process, you will be redirected to a confirmation page. Please check your email to retrieve your newly assigned User ID.

User ID


You are now prepared to sign in and commence your application!

3. Log Into E-Forms

CAUTION: The E-Forms website may experience significant delays. Please refrain from attempting to speed up the site by repeatedly clicking buttons like “Next,” “Save,” “Upload,” or other functions. Each page and save action may require up to 15 seconds to process. This is a prime example of government infrastructure. Thank you, ATF!

Armed with your User ID, return to the E-Forms homepage. Input your User ID and Password.

Log Into E-Forms

Once you’ve successfully logged into the system, you will be automatically redirected to the E-Forms dashboard. This dashboard serves as your central hub for navigating through various ATF Forms and applications. In the center of the dashboard screen, you’ll notice a scrolling selection that displays all the available ATF Forms.

To access the specific form you need, please scroll through the list until you find “FORM 1 ATF F 5320.1.” This form is the one you’ll be using for your application.

FORM 1 ATF F 5320.1


Position your cursor over the Form 1 application and click on it. Please note that there may be a brief delay as the website loads the Form 1 application.

4. Form 1 Applicatin: First, Select Applicant Type

Select Applicant Type

First, you’ll need to make a crucial decision regarding your applicant type. The easiest and most straightforward option is to file as an individual. This choice grants you exclusive rights to possess, transport, and use your Form 1 suppressor kit. Filing as an individual comes with several advantages, including reduced paperwork and lower expenses. For the purpose of this guide, we’ll be proceeding with the individual filing route.

Now, if you are considering filing as a trust, there are some additional steps to be aware of. Establishing a trust will typically require the services of an attorney to draft and notarize the necessary legal documents. When filing as a trust, you’ll also need to download ATF Form 5320.23: Responsible Persons Questionnaire and print a copy for each member of the trust, including yourself. Each member must diligently complete this questionnaire and provide a passport-style photo for upload. Furthermore, after submitting the application, you’ll need to send two sets of fingerprints, one for yourself and one for each trust member, to the ATF.

Next, you’ll be required to scan each Form 23 Questionnaire and upload them to the Responsible Persons section, a step that we’ll delve into further later in the process.

Once you’ve made your selection regarding the applicant type, proceed by clicking “Next.”

  1. Take a moment to thoroughly review the “Intended Use” and “Special Instructions” paragraphs before moving forward.
Special Instructions


In the event that you are opting to file as a trust, ATF offers comprehensive instructions available here. It is essential to carefully peruse these instructions to ensure a thorough understanding of the process. After thoroughly reviewing the instructions, proceed by clicking “Next.”

6. Application Payment (The Famous “Tax Stamp”)

For every NFA application, there is a mandatory $200 fee payable to the ATF, commonly referred to as a “Tax Stamp.” It’s important to note that, in our case, as we are constructing a suppressor for personal use, we do not qualify for any tax exemptions.

The Famous “Tax Stamp”
  1. Choose the option “Tax Paid ($200).”
  2. Disregard the Internal Control Number.
  3. Proceed by clicking “Next.”

7. Entering Applicant’s Personal Information

It’s now time to complete the Applicant Information section. Please be aware that certain details may already be filled in (indicated by black boxes) to safeguard the applicant’s identity.

Entering Applicant’s Personal Information

Please follow these steps:

  1. Check the “No FFL” box.
  2. If applicable to your legal name (e.g., Jr., Sr., III, etc.), select the appropriate Cadence.
  3. Under “Title of the Submitter of the Application,” enter “Owner.”
  4. Set the Country to “United States.”
  5. Provide your home of record address.
  6. Disregard the “plus four” ZIP code box once more.
  7. Double-check that the pre-filled information is accurate.
  8. Answer the YES/NO questions truthfully. Keep in mind that responding “YES” to any of the listed questions may lead to the rejection of your application.
  9. Finally, click on “Next.”

8. Enter Responsible Persons Info and Upload Photo

Redundancy is a recurring theme in government procedures. When you reach the Responsible Persons page, you will encounter the need to input certain personal information once more. If you are filing as a trust, it’s essential to include each individual associated with the trust on this page. Additionally, this is the section where you will scan and upload the Form 23 documents and passport-style photos for each trustee.

Enter Responsible Persons Info
  1. Indicate your status as either “U.S. CITIZEN” or “NON-U.S. CITIZEN.”
  2. If applicable, specify your name’s Cadence.
  3. Ensure that your Title is designated as “Owner.”
  4. Verify the accuracy of your First, Middle, and Last Name.
  5. Confirm the correctness of your Email address.
  6. Proceed to upload a digital passport-style photograph of yourself.

You don’t need a professional photo. Just take a selfie with your phone and upload it. Ensure the photo includes your shoulders and whole face, and avoid glasses, jewelry, or hats. The background should be a plain white or softly colored wall. The file size should not exceed 3MB, and it should measure at least 2 inches by 2 inches when viewed on a desktop monitor. Save the photo in either. JPG or. JPEG format.

For additional Trustees

  1. Click on “Actions.”
  2. Add a new person.
  3. Input the information for each Trustee, similar to how you entered your own details.
  4. Scan and upload the Form 23 and passport photo for each Trustee, if applicable.

After you have added all Responsible Persons, Form 23 documents, and photos (if necessary), scroll to the right.:

For additional Trustees

Enter the below information for yourself. Repeat these steps below for all Trustees if applicable:

  1. Your SSN.
  2. ZIP Code.
  3. State of residence.
  4. City.
  5. Street Address.
  6. Date of Birth.
  7. Country of Birth.
  8. Birth State.
  9. Gender.
  10. Race.
  11. Please skip “UPIN” and click “Next” to proceed.

9. Enter the Local Chief Law Enforcement Officer’s Information

To complete your Form 1 application, you’ll need to send a copy to your local Chief Law Enforcement Officer, commonly referred to as “CLEO.” After your Form 1 application has entered the processing stage, the ATF will email you a “CLEO Copy.” You can find your CLEO by conducting an online search for your local police department or Sheriff’s office.

Enter Local Chief Law Enforcement Officer’s Information

Please provide the following information:

  1. The name of your local police department’s Agency or Department.
  2. The precise name and title of the Sheriff or Police Chief, exactly as it is listed on the department’s official website.
  3. The complete department address, including street address, ZIP code (please exclude the “+4” if applicable), state, city, and county.
  4. Click “Next” to proceed.

10. Enter Your Future Suppressor’s Information


You will use the Line Item page to input the details of your new suppressor. On this page, simply click the “Add Firearm” button to get started.

Enter Your Future Suppressor’s Information The

The First Pop-up Window

The first pop-up window will appear as shown below. If it doesn’t appear, please double-check that your web browser allows pop-ups for this website.

pop-ups enabled for this website.
  1. Certainly, here’s a rewritten version of the instructions with a different phrasing:
  2. Open the pop-up window and choose the “By Manufacturer Code” option.
  3. Enter the code “FMI” next to the Manufacturer Code.
  4. The dropdown menu on the right will populate with “FORM 1 REGISTRATION.” Select this option.
  5. Click on “Verify Manufacturer.” A confirmation message will appear; close this message.
  6. Set the Manufacturer Country to “UNITED STATES.”
  7. Now, click on “Next.”

The Second Pop-up Window

    A second pop-up window will display. This pop-up window operates very slowly each time you select an option because it connects to the ATF’s database of all existing Form 1 model names that have been entered by every other applicant like yourself. Let it take its time while performing these next steps, or the system could crash:

     second pop-up window

    Now comes the fun part: Digitally creating your suppressor in the ATF’s database.

    1. Besides the Product Type, opt for “SILENCER”
    2. Check the box that says “My item description is not in the list, create a new item.”
    3. The Model field can be left empty if you prefer. Alternatively, you can give your suppressor a unique name for some fun! If you do choose to provide a model name, remember that it must be engraved on your suppressor along with the serial number, your name, and your location (city and state). You may receive warnings from the E-Forms website regarding the model/manufacturer information not being recognized; however, you can disregard these warnings. Leaving the Model field blank may speed up your application by a few days.
    4. For Unit of Suppressor Measure, select “CALIBER.”
    5. Input the Caliber of your suppressor. If you intend to use your new suppressor on multiple firearms, enter the largest caliber it will be used with. When entering the caliber, omit words. For instance, input “6.5mm” for 6.5 Creedmoor and “.30” for 300 Blackout.
    6. Specify the Overall Length of your suppressor.
    7. Enter the Serial Number that you wish to engrave on your suppressor. This can generally be anything but must include numbers. Avoid using special characters and phrases.
    8. In the “State Why You Intend To Make Firearm” section, enter “For all lawful purposes.”
    9. Click on “Next.”The First Pop-up Window

    The Third Pop-up Window

    A third pop-up window will appear:

    third pop-up window

    Great news, you can simply disregard this window. Please verify the accuracy of the information you’ve entered on the right-hand side, and then proceed by clicking on the “Finish” button. The popup window may take a brief moment to close before returning you to the Line Item page.

    Line Item page


    You’ll notice a yellow triangle icon under STATUS. This is a standard occurrence. Each time you register a new suppressor, the ATF requires some time to review and add it to their database. The presence of the triangle does not indicate any issues. Please ensure that all the information you’ve entered on the Line Item page is correct before proceeding to the next step.

    1. MANUFACTURER should display “FORM 1 REGISTRATION.”
    2. MANUFACTURER ADDRESS should indicate “UNITED STATES.”
    3. PRODUCT TYPE should show “SILENCER.”
    4. CALIBER should display the caliber you entered.
    5. MODEL should show the model name you entered.
    6. BARREL LENGTH should be left empty.
    7. OVERALL LENGTH should match the length you entered.
    8. SERIAL NUMBER should match the serial number you entered.
    9. If you need to make any edits, you can click on the paper-and-pencil icon.
    10. Now, click on “Next.”

    11. Electronic Documents Page (Trusts Only)


    The subsequent page is the Electronic Documents upload section. This section is specifically relevant to individuals submitting their application as a Trust or Corporation. Additionally, you’ll return to this page after submitting your application to obtain a document from the ATF for mailing fingerprint cards.

    Electronic Documents Page


    When filing as a Trust, it is essential to utilize this section to upload a notarized copy of your trust’s documents. For individuals filing without a trust, there’s no need to take any action on this page.

    Advance to the next step by selecting “Next.”

    12. Certify the Application’s Information and Pay a $200 Tax Stamp


    When you reach the Certify page, you will come across another yellow warning related to your model. The message may request you to submit extra information to the application for “assisting with validation.” Please disregard this request. There is no need to upload any additional photos or documents.

    Pay $200 Tax Stamp
    1. After carefully reading the Certification disclaimer, mark the Certify checkbox.
    2. Proceed by selecting the “Pay” option.

    13. Entering Tax Stamp Payment Information


    A subsequent pop-up window will emerge, and within it, you will need to provide your payment information for the $200 Tax Stamp. As before, please ensure that your web browser is configured to allow pop-up windows from the ATF’s website.

    Entering Tax Stamp Payment Information
    1. Please input your complete name, matching the name on your Debit or Credit Card, in the Account Holder Name field.
    2. Provide your Billing Address, including City, State, ZIP, and Country.
    3. Enter the payment details of your debit or credit card.
    4. Scroll down and select “Continue with Plastic Card Payment.”
    Plastic Card Payment

    Verify the accuracy of all the payment details you have input. After confirming, proceed by clicking “Submit Payment.”

    Then click Submit Payment.


    After the payment is successfully processed, a message will appear in the pop-up window, confirming your payment submission. Close the pop-up window to return to the application dashboard.

    14. Submit Form 1 Application for Processing

    Submit Form 1 Application for Processing


    While on the Certify page, click on “Sign & Submit.” A subsequent pop-up will appear, prompting you to enter your account password. Input your password and select “Submit.” Please note that once you reach this stage, your application will be finalized and unmodifiable. Therefore, review and confirm all previously entered information before proceeding to input your password and click “Submit.”

    clicking Submit

    Once you’ve submitted your application, you’ll be brought back to the login dashboard with a pop-up indicating your Form 1 application has been successfully submitted! You may click on the [+] icon next to the “SUBMITTED/IN PROCESS” tab to the left to view the application.

    15. What Happens Now?

    After you’ve successfully submitted your application, you will be redirected to the login dashboard, where a pop-up will confirm the successful submission of your Form 1 application. To view your application, you can click on the [+] icon located next to the “SUBMITTED/IN PROCESS” tab on the left.

    pdf viewed

    If your application is currently marked as “PENDING RESEARCH,” it typically undergoes a review period lasting between 7 to 15 business days before the ATF proceeds to update the status to “PROCESSING.” Once your application reaches the “PROCESSING” status, you will receive an email containing the CLEO (Chief Law Enforcement Officer) copy of your application. It is essential to mail this copy to your local chief law enforcement officer. Additionally, within the “PROCESSING” status email, you will find a Cover Letter provided. It’s important to note that you must access this email and its attachments using a desktop computer or laptop.

    PROCESSING status email

    Please Note:

    Within 10 business days of receiving the “PROCESSING” email and Cover Letter, you are required to mail two copies of your fingerprints (as well as those of any Trustees) using two FD-258 Fingerprint Cards to the ATF. Failure to do so within the specified 10-day period will result in the rejection of your application, and you will have to wait approximately 30 calendar days to receive a refund of your $200 payment. The Cover Letter you receive contains instructions for mailing your fingerprint cards.

    If your application status shows “PROCESSING” and your Cover Letter has a Control Number, you can download the letter and send your prints right away. This step is only valid when your application is in “PROCESSING” and the letter includes that Control Number. Don’t send your prints if the Control Number is missing or your application isn’t in “PROCESSING” yet. If you’re in “PROCESSING” but haven’t got the Cover Letter yet, try downloading it from your submitted application.

    Please follow the instructions below to download your Cover Letter.

    16. Downloading Your Cover Letter


    If you wish to access your cover letter without delay, please log in again to E-Forms. Proceed to the Form 1 you submitted by selecting the SUBMITTED/IN PROCESS tab, and then click on the Form 1 entry listed within that tab.

    Downloading Your Cover Letter

    Once the form loads, click on the eyeball icon under “Actions.” Your application will load.

    Your application will load.


    After the application loads, proceed to select the “Electronic Documents” tab. Here, you will find your portrait upload listed alongside a new upload option:

    new upload

    Select the “Form1CoverLetter.pdf” document. Your web browser will initiate an automatic download. Once downloaded, open the document and thoroughly review the contents of the Cover Letter:

    review the Cover Letter


    The Cover Letter will contain essential information, including your serial number, the date of your application submission, your name, and your contact number. Equally important is the inclusion of the Control Number. If this field is left empty, you cannot print the letter, and sending your fingerprints is not possible at this stage. However, if the Control Number is present, please verify that all your other information on this form is accurate before printing it. The Cover Letter also provides the mailing address for your fingerprint cards. When sending your fingerprint cards, it’s imperative to enclose this Cover Letter within the same envelope. This allows the ATF to match your prints with your application by using the Control Number.

    Need guidance on how to roll your fingerprints for the application? The instructions explain how to obtain fingerprint cards from the ATF, as well as the steps for taking and mailing your fingerprints.

    17. Frequently Asked Questions

    My Application Status Reads “Pending Research.” What’s the Next Step?

    At this point, you should await an email notification. The ATF needs to record the details of your suppressor before they can proceed with the application. Once they commence processing, you’ll receive an email update containing a cover letter with fingerprint mailing instructions, including a Control Number. It’s essential to emphasize that mailing your prints is not possible without the Control Number present on the cover letter.

    What Follows After I Send My Fingerprints?

    After you’ve mailed your fingerprints, remember, that the ATF won’t send a confirmation that they received them. To be sure your prints get to the ATF safely at the right address listed in the cover letter, consider including a tracking number with your package.

    How Do I Submit the “CLEO Copy” of My Application?

    Once your application transitions to “PROCESSING” status, the ATF will email you a copy of your application designated as the “CLEO Copy.” This copy should be delivered or mailed to your local chief law enforcement officer.

    What If My CLEO Returns or Declines My Form 1 Paperwork?

    It’s important to note that you are not obligated to convince your CLEO to retain records of your Form 1 application. Additionally, your CLEO does not have the authority to obstruct the processing of your Form 1 application by the ATF. Numerous individuals have reported their CLEO Copy applications being either returned or refused by the police department or officer. Your sole responsibility is to make an attempt to submit the form to the CLEO, and whether they decide to retain it or not is entirely at their discretion.

    What Happens When My Form 1 Application Is Approved?

    Upon the successful processing of your Form 1 application, you will receive a notification indicating that your application status has changed to “APPROVED.” The ATF will then send you your tax stamp and approval form for your new suppressor via email.

    Form 1 is Approved


    Please ensure you never delete this email. Physical tax stamps will not be sent to you by mail. Instead, print the form and digitally-generated tax stamps and store them securely in a safe location. At this stage, you are legally permitted to cut, drill, and machine the parts required for the assembly of your suppressor. 

    Encountering an issue with your application? You can find ATF’s customer service to be surprisingly helpful. For help, first log into e-Forms. Then, at the dashboard’s top-left, click “Ask The Experts.” This lets you send a message to the ATF team handling Form 1 applications. An ATF agent will reply to your registered email, usually within 2 days.

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