Guides
Everything you need to know about fingerprinting, EFT files, and ATF eForms. From rolling your own prints to filing your first Form 4.
Getting Started
How to Roll Your Own Fingerprints on an FD-258 Card
Learn how to roll clean fingerprints on an FD-258 card at home. A step-by-step guide to inking, pressure, and rolling technique with no special equipment.
What DPI Do I Need to Scan a Fingerprint Card?
Find the correct scanner settings and resolution requirements to get a usable fingerprint card scan from any standard home flatbed printer or scanner.
How to Tell If Your Fingerprint Rolls Are Good Enough for ATF
Learn how to evaluate your rolled fingerprint card for ridge detail and common rolling errors, and how to use our free online NFIQ quality check tool.
Using SLAP & ROLL
How to Convert an FD-258 Fingerprint Card to an EFT File at Home
A complete walkthrough showing you how to convert a scanned FD-258 fingerprint card into an ATF-ready EFT file using SLAP & ROLL's secure online tool.
How to Get an EFT File for ATF eForms: All Options Compared
Learn how to get an EFT fingerprint file for your ATF eForm 1 or eForm 4. We compare in-person fingerprint appointments, FFL livescans, and DIY fingerprint card scanning.
How to Edit an EFT File: Fix a Typo, Change Your Address, or Update Your Name
Learn how to decode, edit, and re-export your EFT fingerprint files with our free online EFT editor. Easily correct typos, change addresses, or update names.
Understanding NFIQ Scores: What They Mean for Your EFT Submission
Learn what the NIST Fingerprint Image Quality (NFIQ) score means, how the FBI uses it, and how it impacts the acceptance of your ATF eForm submissions.
ATF eForms
How to File an eForm 4 (Step-by-Step)
A step-by-step guide to filing an ATF eForm 4 for a suppressor or SBR transfer. Learn how to prepare your application, pay the tax stamp, and upload your EFT.
How to File an eForm 1 to Make Your Own SBR
Learn how to file an ATF eForm 1 to legally manufacture your own SBR, suppressor, or AOW. A complete walkthrough from account registration to EFT upload.
Understanding eForm Statuses: What Each Stage Means
Understand each stage of the ATF eForms portal approval process, from Pending Research and Submitted to In Process, Approved, or Disapproved status.
Technical Reference
ATF eForm Fingerprint Requirements: The Complete Reference
The complete reference for ATF eForm fingerprint specifications. Learn the exact requirements for DPI, file format, and Type-4 vs Type-14 records.
EFT File Format Explained: What's Actually Inside Your .eft File
A technical deep-dive into the Electronic Biometric Transmission Specification (EBTS) format and what data is actually stored inside an EFT fingerprint file.