Unlike modern revolvers, old Smiths had parts hand-filed to match a specific frame. Installing a cylinder or barrel without checking serial alignment will destroy timing and lockup.
The Smith & Wesson Model 19 is a revolver featured on the K-frame (medium frame). It was the first revolver chambered in .357 Magnum that was practical for regular police carry and civilian use, largely due to the efforts of firearms instructor Bill Jordan, who collaborated with S&W on its design.
Before you install any component, you must positively identify your revolver. Smith & Wesson did not stamp "MOD-195" on any frame. Instead, look for these serial ranges:
Critical: The serial number is located on the bottom of the grip frame. You must remove the stocks (grips) to see it fully. It will have an "S" prefix (e.g., S 98765).
Because the cylinder is bored straight through (no shoulder for the .45 ACP rimless case), headspace is controlled by the moon clips.
Install test:
Identifying a Smith & Wesson Model 19-5 by its serial number is the primary method for determining its production date, typically falling between 1982 and 1988. The Model 19-5 represents a significant engineering transition in the "Combat Magnum" lineage, most notably the elimination of the pinned barrel and recessed cylinder. Locating and Interpreting the Serial Number
The official serial number on a Smith & Wesson revolver is almost always located on the bottom of the grip frame (butt).
Alpha-Numeric Format: By the time of the Model 19-5's release in 1982, Smith & Wesson had transitioned to a three-letter prefix followed by four digits (e.g., ABC1234).
Other Markings: If you open the cylinder, you will see the model number (MOD 19-5) stamped on the frame in the yoke area. Do not confuse "assembly numbers" found in this area with the actual serial number; assembly numbers were internal factory codes used during manufacturing. Service Marks: A star symbol (
) next to a serial number indicates the firearm was returned to the factory for major service or refinishing. Production Timeline and Engineering Changes smith and wesson model 195 serial numbers install
The "19-5" designation specifically marks the fifth major engineering revision of the Model 19. Model Revision Year Introduced Key Engineering Change Model 19-4 Relocated gas check on yoke Model 19-5 1982
Eliminated pinned barrel and counterbore (recessed) cylinders Model 19-6 New yoke retention system How to Verify Your Serial Number
Since there is no public, searchable online database for S&W serial numbers, you can use these authoritative methods to "install" the correct date and history for your specific unit:
Reference the Standard Catalog: The Standard Catalog of Smith & Wesson is the definitive resource for matching serial number ranges to specific shipping years.
Request a Factory Letter: For a fee, the Smith & Wesson Historical Foundation provides official "Letters of Authenticity" that detail exactly when your firearm was shipped and its original configuration.
Customer Service: You can contact Smith & Wesson Customer Service directly; they can often provide the manufacture year over the phone if you provide the serial number.
Determining the production date of a Smith & Wesson Model of 1950
(the precursor to the Model 24 and Model 26) involves identifying the frame size and checking specific serial number ranges. Prior to 1957, Smith & Wesson primarily used names rather than model numbers, and the Model of 1950 was produced on the large Locating the Serial Number The "serial number of record" is stamped on the bottom of the grip frame
. Any letters appearing here are part of the serial number and must be included for accurate dating. Smith & Wesson Historical Foundation Other markings to be aware of include: Yoke Area:
On some later revolvers, the model number (e.g., "MOD 24") may be stamped here. Assembly Numbers: Unlike modern revolvers, old Smiths had parts hand-filed
Frequently found on the yoke or inside the frame, these were used only to keep hand-fitted parts together during manufacturing and are the serial number. Secondary Locations: Older S&W models may also have the serial number on the bottom of the barrel rear of the cylinder Smith & Wesson Historical Foundation Serial Number Ranges for Model 1950 (N-Frame) The Model of 1950 revolvers, which included the .44 Target .44 Military .45 Target , typically used the "S" prefix or the later "N" prefix Production Year Range Serial Number Range (Approximate) 1946 – 1947 S62,489 – S71,999 1948 – 1952 S72,000 – S89,999 (Transition Period) 1954 – 1956 S103,000 – S165,000 1957 (Model Numbering Begins) S165,001 – S183,999 Key Variants: The .44 Military variant of the 1950 Model. The .44 Target version of the 1950 Model. The .45 Target (Light Barrel) variant of the 1950 Model. Evolution and Model Numbering
, Smith & Wesson transitioned from names to numerical designations. If your revolver is stamped with a model number like "24" or "26" behind the yoke, it was likely produced after this date. Engineering changes are indicated by a dash number
(e.g., 24-1), which signifies a specific update like a thread direction change in the extractor rod. Smith & Wesson Historical Foundation Verification and History
Because Smith & Wesson often used overlapping serial number ranges for different frame sizes during this era, the only way to get a guaranteed production and shipping date is through a Letter of Authenticity . This service is provided by the Smith & Wesson Historical Foundation
and can provide specific details about the original retailer and shipping date. Smith & Wesson Historical Foundation specific engineering changes
Deciphering Your Smith & Wesson Model 19-5: A Serial Number Guide If you’ve recently acquired a Smith & Wesson Model 19-5
, or you're looking to verify its authenticity, understanding the serial number is your first step. Often misidentified as a "Model 195," this specific variant is actually the fifth engineering revision of the legendary .357 Combat Magnum
Here is how to locate, identify, and understand the markings on your Model 19-5. Where to Find the Official Serial Number
On a Smith & Wesson revolver, there are several numbers stamped on various parts, but only one is the legal, official serial number. Smith & Wesson Historical Foundation The Bottom of the Grip (The Butt):
This is the most authoritative location for the serial number. If your revolver has large "target" wooden stocks, you may need to remove them with a screwdriver to see the full number. The Yoke Cutout: The Smith & Wesson Model 19 is a
When you swing the cylinder out, you will see numbers stamped on the frame behind the "crane" or "yoke". : This confirms the model and the engineering change. The Serial Number
: Sometimes the serial number is repeated here, but it is often accompanied by "assembly numbers"—random digits used by the factory to keep parts together during manufacturing. Always rely on the number on the butt for official records Smith & Wesson Historical Foundation Interpreting the 19-5 Serial Format By the time the Model 19-5 was in production (beginning in
), Smith & Wesson had moved away from the older "K-prefix" (e.g., K12345) to a more modern three-letter, four-digit system.
Note: Before proceeding, it’s important to clarify a technical nuance. Smith & Wesson did not manufacture a factory-designated "Model 195." The most famous S&W .45 ACP revolver is the Model 1917. However, collectors and gunsmiths often refer to the 1950 Target Model (pre-Model 26) or the 1950 .45 Army Model (pre-Model 22). The number "195" in user searches frequently refers to a custom build or a misunderstood model year (e.g., 1950). For the purpose of this guide, we are addressing the installation of a barrel or cylinder on a Post-War N-Frame .45 ACP revolver (circa 1950–1955) that is commonly mislabeled as the "Model 195."
Do not attempt this without a barrel vise. The Model 195’s frame is soft carbon steel—twisting it cracks the forcing cone.
This is where 90% of installations fail. The Model 195 uses a long-action hammer (pre-1955). Newer cylinders have a short-action ratchet.
Installing a used period-correct cylinder:
Even with matching serial numbers, old revolvers have wear. Here are the three most common issues after installation:
| Symptom | Cause | Fix based on serial era | | :--- | :--- | :--- | | Cylinder binds after 6 shots | Extractor rod unscrewed (reverse threads on S&W). | Tighten rod. Pre-1955 guns have left-hand threads. | | Hammer won't cock on one chamber | Ratchet tooth worn. Serial mismatch between cylinder and hand. | Replace hand with N-frame long-action part. | | Bullets shave lead at barrel gap | Barrel over-indexed (too tight). Gap less than 0.003”. | Re-cut forcing cone or re-set barrel shoulder. |