Home / Why two years? / The number on the gun is not the original one

The number you are reading is not the number the factory stamped

The number on the gun is not the original one

The serial you read off the receiver may be a later addition, and in one documented case the change was forced by a character set rather than by anyone trying to hide anything.

A real case

From the record

A Mosin-Nagant owner describing the marking: "the US importer decided to transliterate the original barrel serial number. the Cyrillic letters А Ж became English letters A ZH". The original number is still visible on the barrel; the number on the receiver is a transliteration of it.

What actually produces the discrepancy

This is not folklore — it is regulated. ATF Ruling 2002-6 addresses exactly the case of an imported firearm whose marking contained a Cyrillic character, because such a marking could not be transmitted through ordinary import channels and the arm had to be remarked. Importers are also required to add their own marks, and on military surplus arms those are frequently more prominent than the factory number.

What to watch for

Arsenal rebuilds add a third layer: a Soviet rifle can carry its original factory number, a lined-out earlier prefix, and a new number stamped above it from the depot that overhauled it. Three numbers, one firearm, all genuine — and a chart that reads only the factory sequence will fail on it.

What to do about it

Working with this cause
  • Look for a lined-out or over-stamped number. Evidence of a previous number is more informative than the current one.
  • Check the barrel as well as the receiver. On an imported military arm the original number is often on the barrel while the import mark is on the receiver.
  • If the receiver number matches no chart at all, try the barrel number before concluding the gun is unidentifiable.
  • Treat a removed or defaced serial as a legal question rather than a dating one, and get advice before doing anything else with the firearm.

Sources for this page: ATF Ruling 2002-6 — on markings containing a Cyrillic character and the requirement to remark imported firearms · Mosin-Nagant identification reference — original serials, lined-out prefixes and import markings · Carcano Compendium — production year and the fascist-era year numbering.

Other reasons two sources disagree

The table and the gun disagreeThe published table is known to be impreciseThe maker’s own lookup returns two yearsThe numbers are not in the order you assumeThere is nothing left to check
The lookup shows its working

Every result names the chart it came from, the threshold it rests on, and — where the published table is documented as imprecise — says so on the result itself rather than returning a bare year.

Open the serial number lookup All the causes

Compiled and sources last checked 2026-10-14. This page explains a documented discrepancy; it does not date your firearm.