The violation the ATF cites more than any other is not dramatic. It is your bound book.
In fiscal year 2025, inspectors cited 27 CFR 478.125(e) 40,763 times. That is the failure to keep an accurate, complete, and timely acquisition and disposition record. No other firearms violation came close. The next one, failing to complete forms as prescribed, was cited 31,006 times, according to the ATF’s Facts and Figures for Fiscal Year 2025.
Here is what that violation looks like in practice, and how to keep it out of your next inspection.
What accurate, complete, and timely means
Your bound book tracks every firearm that comes into your inventory and where it goes. Three words in the regulation do most of the work.
Accurate means the entry matches the firearm in your hands. The acquisition entry records the date of receipt and who you received it from, by name and address or name and license number. It also records the manufacturer and importer (if any), model, serial number, type, and caliber or gauge. One transposed digit in a serial number is a discrepancy.
Complete means every firearm has an acquisition entry, and every firearm that leaves has a disposition entry showing the date and who it went to. There are no gaps in either direction.
Timely means the entry is made inside the deadline. You must record an acquisition by the close of the next business day after you receive the firearm. You must record a disposition within seven days of the transaction.
One exception matters for shops with a gunsmith. A firearm brought in for adjustment or repair and returned to the same person on the same day does not need an entry.
The two gaps inspectors find
Most bound book findings come down to two situations.
The first is a firearm on your shelf with no acquisition entry. The gun is physically in the store, but the book does not show it ever arrived. Trade-ins and consignments put on the rack before they are logged are a common source.
The second is a firearm that is gone with no disposition entry. The book shows you acquired it, but there is no record of the sale, transfer, or return that moved it out. An inspector cannot account for where it went.
Either one turns a routine inspection into a longer conversation.
How to stay off the list
Reconcile your book against your shelf on a schedule, not once a year. Count what is physically present, match it line by line to the record in both directions, and resolve every discrepancy while you still remember the transaction.
Make the entry part of the moment the firearm moves. The deadlines are short, and the gap between a firearm moving and the book being updated is where timeliness violations come from.
If you want a structured way to run that check, our FFL self-audit checklist walks through the bound book first, then the rest of the violations the ATF cites most.
Where AIM fits
A paper bound book depends on someone writing every entry by hand and never falling behind. AIM keeps your acquisition and disposition record with your inventory, and it works with FastBound for electronic bound book processing, so the record updates as the firearm moves rather than after the fact.
If you are comparing options, see what to look for in ATF bound book software. For the other half of your recordkeeping, see the ATF Form 4473 compliance guide.
This post describes federal recordkeeping requirements and published ATF inspection data. It is not legal advice. Confirm current requirements with the ATF, 27 CFR Part 478, and your own counsel. AIM helps you stay compliant. It does not replace your own compliance responsibility.