An M1 Garand’s serial number dates the receiver and nothing else. Read the maker and serial from the receiver heel, match the serial against the published production ranges to get a year, then read the barrel date separately. On a rifle that was never rebuilt the two sit within the same production window. On most surviving Garands they do not, because the Army rebuilt these rifles for thirty years.
Three numbers, three different stories
A Garand carries three dating clues, and they answer different questions. The serial dates the receiver. The barrel date dates the barrel, which on a rebuilt rifle can be a decade later. Rebuild stamps date the overhaul and name the depot. Treating any one of them as “the date of the rifle” is the commonest mistake made with these guns.
Start at the receiver heel
The heel is the flat at the rear of the receiver, and it carries the legend that identifies the rifle: U.S. RIFLE / CAL. .30 / M1 / SPRINGFIELD ARMORY / 1234567. The maker is spelled out, so you never have to infer it. The four makers appear as SPRINGFIELD ARMORY, WINCHESTER, H.R.A. (Harrington & Richardson), and INTERNATIONAL HARVESTER.
That matters because the serial blocks are not in maker order. Springfield and Winchester ranges interleave, so a serial alone can point at either. Read the heel, then use the serial for the year.
Serial number blocks by maker
These are the blocks published by the National Park Service for Springfield Armory National Historic Site, the source most third-party charts copy.
| Serial range | Maker | Period |
|---|---|---|
| 1 – 100,000 | Springfield Armory | 1937–1940 |
| 100,001 – 165,500 | Winchester | 1941–1942 |
| 165,501 – 1,200,000 | Springfield Armory | 1940–1943 |
| 1,200,001 – 1,357,473 | Winchester | 1942–1943 |
| 1,357,474 – 2,305,849 | Springfield Armory | 1943 |
| 2,305,850 – 2,655,849 | Winchester | 1943–1945 |
| 2,656,149 – 4,200,000 | Springfield Armory | 1944–1945 |
| ~1,600,000 – 1,640,000 | Winchester (WIN-13) | 1945 |
| 4,200,001 – 4,399,999 | Springfield Armory | 1952–1954 |
| 4,400,000 – 4,660,000 | International Harvester | 1953–1954 |
| 4,660,001 – 4,800,000 | Harrington & Richardson | 1953–1954 |
| 5,000,000 – 5,000,500 | Springfield Armory | Aug 1952 |
| 5,000,501 – 5,278,245 | International Harvester | 1954–1956 |
| 5,278,246 – 5,488,246 | Springfield Armory | 1954–1955 |
| 5,488,247 – 5,793,847 | Harrington & Richardson | 1954–1956 |
| 5,793,848 – 6,099,905 | Springfield Armory | 1955–1957 |
| 6,034,330 – 6,034,729 | Harrington & Richardson | Aug 1956 |
Springfield stopped M1 production in October 1945 with the last rifle in the 3,888,xxx range and resumed in 1952 at 4,200,000, leaving roughly 312,000 unused numbers.
Narrowing a wartime rifle to a year
For a closer read, compare the serial against the December year-end figures.
| Year end | Springfield Armory | Winchester |
|---|---|---|
| Dec 1939 | 23,567 | — |
| Dec 1940 | 100,000 (plus 165,001–169,073) | — |
| Dec 1941 | 429,811 | 137,960 |
| Dec 1942 | 1,090,310 | 1,276,102 |
| Dec 1943 | 2,305,849 | 2,364,642 |
| Dec 1944 | 3,359,159 | 2,533,142 |
| End of production | ~3,888,xxx, Oct 1945 | June 1945 |
A Springfield in the 2.9 million range is a mid-1944 receiver; one at 1.5 million is early 1943.
Winchester’s two numbering systems
Winchester changed its numbering in January 1945, dropping from the 2.5 million block to a 1.6 million block. Collectors call the result WIN-13 rifles; roughly 40,000 were made before the line closed in June 1945, with observed examples running from about 1,602,xxx to 1,639,xxx.
This trips people up constantly. A Winchester serial beginning 16 is not an early rifle. It is a very late one.
Reading the barrel date
Barrel dates are stamped as a maker abbreviation plus month and year: SA 6-44 is a Springfield Armory barrel from June 1944. Draw the operating rod back and read it off the side of the barrel.
This is the most useful single check on whether a rifle was rebuilt. A 1944 receiver with a 1944 barrel is plausible as an original pairing. A 1944 receiver with an SA 5-54 barrel went through a postwar overhaul and got a new tube. Neither is wrong. They are different rifles, and they should carry different prices.
What “correct” actually means
“Correct” and “original” are not the same word, and collectors use the first one deliberately. Original means the part left the factory on that rifle. Correct means the part is of the type and drawing revision that the factory was fitting to rifles in that serial window.
The distinction exists because, as Scott Duff documents, none of the manufacturers assembled rifles in exact serial number sequence. Earlier parts turn up on later rifles straight from the factory. Originality is therefore argued from data sheets recorded off known rifles rather than from a rule, which is why an honest listing says “correct for the period”.
There is no published numeric tolerance for the receiver-to-barrel gap. The working convention: a barrel dated inside the same production window, typically weeks to a few months, reads as an original pairing, and a barrel dated years later reads as a service replacement.
Drawing numbers
The receiver also carries a drawing number on its right leg, visible when the rifle is field-stripped. Wartime receivers begin D28291 plus a revision number; postwar receivers use D6528291 and F6528291. Bolts follow the same pattern, D28287 in wartime and 6528287 postwar.
Revision numbers narrow the window further, but mapping a revision to a date is reference-table work rather than something you read off the part. Duff’s data sheet volumes are the standard source, and we do not guess at it.
Rebuild stamps
Most surviving Garands were overhauled at least once. Between 1945 and 1948 alone the arsenals made 563,310 replacement barrels, 529,172 operating rods, and 291,971 stocks, fitted improved T105E1 rear sights, and re-Parkerized receivers wholesale. The depots signed their work, usually on the stock:
- Springfield Armory —
sa/shm(c. 1945–1947),sa/spg(c. 1950),sa/jlg(after July 1950),sain a box (early 1950s on),sa-52behind the rear sight - Rock Island Arsenal —
ria/fk(1941–1946),ria/eb(1947–1958) - Augusta Arsenal —
aawith a letter or number suffix - Red River Arsenal / Depot —
rraorrrad - Anniston
anora4, Ogdenog, Beniciaba, Raritanra, San Antoniosaa, Mt. Rainiermr, Hawaii Ordnance Depothod
The 1960s programmes hand-etched the receiver instead, with a facility code and a month and year: lead for Letterkenny, te for Tooele, sa for Springfield, rra or rrad for Red River.
One more tell: an overhaul proof mark is a block p in a square, or a bare p, on the pistol grip. A factory proof is a circled p.
CMP rifles and import marks
Most American Garands in civilian hands came through the Civilian Marksmanship Program, whose grade definitions are worth knowing because they are precise. Service Grade means “all correct parts for the date of manufacture with 80% or better overall original metal finish” and a stock with “the appropriate original inspector’s cartouche”. Field Grade rifles “have been refinished or rebuilt at least once while in military service and will likely have some parts from other manufacturers”. Rack Grade rifles were rebuilt several times and sell as is. Special Grade rifles get a new barrel and a new stock with a CMP cartouche.
Note what Service Grade does not promise: correct parts for the period is not the same as parts original to that rifle.
Import marks are the other half of the origin question. The Gun Control Act of 1968 requires a licensed importer to mark imported firearms with its name and city and State, or name and abbreviated licence number, plus the country of manufacture. Commercially re-imported Garands carry that legend on the barrel, the best known being the 1980s Korean-return batch stamped for Blue Sky of Arlington, Virginia. CMP rifles typically carry no import mark, so an unmarked barrel is not evidence the rifle never left the country.
Common misidentifications
- Treating the serial number as the rifle’s build date. It dates the receiver. The rifle as assembled today may be twenty years younger.
- Reading a later barrel date as a red flag. Over half a million replacement barrels were made in the first three postwar years. A rebarrelled Garand is the normal case, not the suspicious one.
- Assuming a serial number identifies the maker. Springfield and Winchester blocks interleave. The heel names the maker; the serial gives the year.
- Calling a low-numbered Winchester an early rifle. A Winchester in the 1.6 million range is a WIN-13 from the first half of 1945, not a 1940 gun.
- Reading “mixmaster” as fake. A mixed-parts Garand is a service rebuild. It is honest history and it shoots.
- Reading CMP Service Grade as “all original”. Correct parts for the date of manufacture is a different claim.
- Mistaking the receiver drawing number for a serial.
D28291is a part drawing, not the rifle’s number. - Assuming no import mark means the rifle never left the US. CMP returns from Europe generally came in unmarked.
On the floor at OSA
We list Garands as individual rifles, with the heel stamp, serial, barrel date, and any rebuild marks stated up front and photographed on the actual gun. Two on the shelf right now show both sides of the dating question. A Springfield with a 1944 receiver and an SA 5-54 barrel is a textbook postwar rebuild, a wartime receiver rebarrelled a decade later and graded on what it is. A 1945 Springfield Armory CMP Service Grade rifle shows the other path, with correct parts for the period and a CMP grading behind it.
The rest of the case is on the M1 Garand page. Tell us the maker, serial range, or barrel date you are after and we will tell you honestly what we have.
General information for collectors, not legal or investment advice. Serial ranges and markings vary between makers and rebuild programmes; verify details on the individual firearm.
Common Questions
What year was my M1 Garand made?
Read the maker and serial number from the receiver heel, then place the serial against the published blocks. As rough anchors for Springfield Armory rifles: under 100,000 is pre-1941, about 430,000 is the end of 1941, about 1.09 million the end of 1942, about 2.31 million the end of 1943, about 3.36 million the end of 1944, and anything from 4.2 million up is postwar production restarted in 1952. Winchester ran its own blocks, ending 1941 near 138,000, 1942 near 1.28 million, 1943 near 2.36 million, and 1944 near 2.53 million. Remember what you have actually established: this is the date the receiver was made, and nothing more. The barrel, stock, and small parts may all be later, and on a rebuilt rifle they usually are. To date the rifle as it stands in front of you, read the barrel date and any rebuild stamps as well, then describe it as the combination it is.Should the barrel date match the receiver date on an M1 Garand?
On an unrebuilt rifle they should sit in the same production window, typically weeks to a few months apart, because barrels were fitted shortly after receivers were finished. A 1944 receiver with a barrel marked SA 3-44 is very likely an original pairing. There is no published numeric tolerance, though, so treat it as a judgement rather than a test with a pass mark. A barrel dated years after the receiver means the rifle was rebarrelled in service, which happened to a large majority of surviving Garands. That is not a defect and it does not make the rifle less shootable. Over half a million replacement barrels were produced in the first three postwar years alone, so a later barrel is the normal outcome rather than the suspicious one. It does change what the rifle is, and therefore what it is worth, so it belongs in the description rather than in the fine print.What does "correct" mean on an M1 Garand?
Correct means a part is of the type and drawing revision that the factory was fitting to rifles in that serial range. Original means the part physically left the factory on that specific rifle. Collectors lean on the first word because the second is usually unprovable. Scott Duff’s research makes the reason plain: none of the manufacturers assembled rifles in exact serial number sequence, so earlier parts routinely appear on later rifles straight from the production line. Originality is therefore argued from data sheets recorded off known unmolested rifles, not from a rule anyone can apply at a gun show. A seller who says “correct for the period” is being accurate about what can be checked. A seller who says “100% original” about a rifle with no documented provenance is claiming more than the evidence supports. Comparing two rifles at similar money, ask which parts were verified correct and against what reference.What do the letters stamped on my Garand's stock mean?
They are almost always arsenal rebuild marks, which tell you where the rifle was overhauled and roughly when. Common ones include sa in a box and sa/jlg for Springfield Armory, ria/fk and ria/eb for Rock Island Arsenal, aa for Augusta Arsenal, rra or rrad for Red River, an or a4 for Anniston, og for Ogden, ba for Benicia, and ra for Raritan. Overhaul programmes of the 1960s hand-etched the receiver instead with a facility code and a month and year. Separately, a block p in a square or on its own on the pistol grip is an overhaul proof mark; a circled p is a factory proof. Finding rebuild marks does not devalue a shooter, but it settles the question of whether the rifle is in as-issued configuration. Stocks were also swapped freely during overhauls, so a rebuild stamp proves where that piece of wood was worked on, which is not always the same as where the rifle was.Do CMP Garands have import marks?
Generally no. Rifles distributed through the Civilian Marksmanship Program, including those returned from allied countries in Europe, typically carry no importer’s legend on the barrel. Commercially re-imported Garands do. The Gun Control Act of 1968 requires a licensed importer to stamp its name and city and State, or its name and abbreviated licence number, along with the country of manufacture. The best-known example is the batch of Korean-service rifles imported in the 1980s and marked for Blue Sky of Arlington, Virginia, which is stamped on the barrel and is easy to spot. The practical consequence for a buyer is that an unmarked barrel does not prove a rifle spent its whole life in American hands, and a marked one is simply a rifle with a documented commercial import history. Import marks vary in how heavily they were applied, and a deep, coarsely placed stamp costs more value than a small tidy one, so judge the execution rather than the fact.Sources
- U.S. National Park Service, Springfield Armory National Historic Site — U.S. Rifle M1 Garand Serial Number Ranges (serial blocks, month-by-month year-end figures, WIN-13, postwar totals): https://www.nps.gov/spar/learn/historyculture/upload/us%20m1%20garand%20rifle%20serial%20number%20ranges.doc
- Scott A. Duff Publications — Who Made M1 Garands? (maker production totals and years): https://scott-duff.com/who-made-m1-garands/
- Scott A. Duff Publications — The M1 Garand: Serial Numbers & Data Sheets and The M1 Garand: Post World War II (assembly out of serial sequence; data-sheet method for determining correct components): https://scott-duff.com/product/m1-garand-serial-data-sheets/
- American Rifleman (NRA) — M1 Garand Rebuilds: History & Markings (arsenal rebuild stamps, 1960s receiver etchings, overhaul proof marks, 1945–1948 replacement part figures): https://www.americanrifleman.org/content/m1-garand-rebuilds-history-markings/
- Civilian Marksmanship Program — M1 Garand grade definitions: https://thecmp.org/sales-and-service/m1-garand/
- eCFR, 27 CFR 478.92 — identification of firearms by licensed importers: https://www.ecfr.gov/current/title-27/chapter-II/subchapter-B/part-478/subpart-F/section-478.92
- Relics & Rifles — M1 Garand identification and dating reference (heel legend format, barrel date location): https://www.relicsandrifles.com/reference/m1-garand.html