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Palmetto State Armory
Glock 19 Gen5 MOS
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Your serial number has no prefix
The chart you are being compared against lists serials in the form PREFIX-NUMBER — 170-00001. Yours is a plain run of digits. That is not a mistake, and it does not mean the serial is invalid: it usually means the gun was made before the numbering convention changed.
Date your firearm by its serial number
Every result names the documented threshold it came from, so you can check the reasoning yourself.
Open the serial number lookupThe lookup compares like with like. A serial is only matched against entries of the same shape — the same number of numeric groups and the same leading prefix. Comparing a plain number against hyphenated ranges would produce a confident, wrong year, so the lookup refuses instead. That refusal is the feature.
What the published chart actually shows
This is measured from the manufacturer's own published production chart — the source the lookup is built on. Concretely: Browning, Ruger's chart, 1762 documented year thresholds across 120 models:
| Era | Chart entries | Plain numeric | Prefixed or hyphenated |
|---|---|---|---|
| Before 1970 | 127 | 119 (93.7%) | 8 |
| 1970–1999 | 785 | 1 (0.1%) | 784 (99.9%) |
| 2000 and later | 850 | 4 (0.5%) | 846 (99.5%) |
So a plain number is the normal form for a pre-1970 gun, and the hyphenated form is the normal one afterwards. The date the convention changed is not a coincidence and it is not a Ruger-specific quirk — the US Gun Control Act of 1968 required serial numbers on firearms made or imported from 22 October 1968, and makers standardised their numbering systems around the same period.
The exceptions are worth knowing because they are the ones that confuse: of the 127 pre-1970 entries, 8 are not a plain run. Some carry a letter prefix instead — the Bearcat, for instance, used F483 and X454 in 1959 and 1960. If your serial looks like that, enter the letter: it is part of the serial, not a separate stamping.
The trap: one model, two formats
10 of the 120 model families in the published chart have serials in both eras — the same model was in production across 1970 and was renumbered when the system changed. 10/22 Rifle, 44 Carbine Rifle, Bearcat & Super Bearcat Revolver, Blackhawk Revolver are the clearest cases.
That matters because it means the format alone does not identify the model series. A plain number and a hyphenated number can belong to the same gun at different points in its production run.
What to do
- Select the pre-1970 model line in the lookup if the chart offers one for your model. The plain-numeric entries are there.
- Check the chart rows before 1970 on the make page — the earliest thresholds are plain numbers, and that is the correct comparison for a plain serial.
- Look for a prefix stamped away from the main serial. Some makers stamped the prefix on a different face of the frame, or the prefix was part of a separate assembly marking and has worn off.
- Do not pad the number to fit. Adding a leading zero or a guessed prefix will produce a year, and that year will be wrong. The lookup cannot tell that you invented the digits.
Where a specific year matters legally or financially — a transfer, an appraisal, an insurance schedule — a chart-based estimate is not documentation. Only the manufacturer's own letter of authenticity is.
Why does the lookup need a prefix at all?
Because the published chart is organised by prefix block. Within one model family the same number can appear under different prefixes covering different year ranges, so the prefix is what selects the right block. Comparing without it would silently pick the wrong range.
My gun is from the 1990s but the serial has no prefix. Is that possible?
It happens, but it is uncommon — in the chart above, only 1 of 785 entries in 1970–1999 are plain numeric. Check first that you have not missed a prefix block stamped on a different part of the frame, and check whether the number you are reading is an assembly number rather than the serial.
Could the number be a different marking entirely?
Yes — assembly numbers, inspector stamps and proof marks sit close to the serial and use similar-looking digits. A serial should be the most prominent, deepest and most consistent stamping on the frame.