Smith & Wesson Model 66 .357 Magnum Revolver, 4.25″ 6-Round

The Smith & Wesson Model 66 .357 Magnum Revolver, 4.25″ 6-Round is a K-Frame stainless classic that earned its stripes in holsters from patrol cars to deer camps. Chambered in .357 Magnum, this 4.25-inch six-shooter gives you the proven double/single-action platform that’s been a favorite of collectors and shooters since the 1970s. Matte stainless finish, adjustable white-outline rear sight, and red ramp front sight make this revolver ready for range work or field carry. If you want a stainless K-Frame that doesn’t mess around, this Model 66 is the one.

Manufacturer	Smith & Wesson
Model	Model 66
Material	Stainless steel (frame, barrel, cylinder) per manufacturer specs
Compatibility	.357 Magnum / .38 Special +P
Finish	Matte stainless
Weight	Approximately 35 oz (unloaded) per manufacturer specs
Condition	New production

Key Features

• K-Frame Stainless Platform: Why it matters — the K-Frame is the Goldilocks size: big enough to tame .357 Magnum recoil, small enough to carry all day. Stainless means no rust worries in rain, sweat, or salt air.
• 4.25-Inch Barrel: Why it matters — this barrel length splits the difference between a snubby and a field revolver. You get a full sight radius for accuracy, but it still fits a duty holster or a chest rig for hiking.
• Adjustable White-Outline Rear / Red Ramp Front Sights: Why it matters — the white outline rear and red ramp front give you a fast, high-contrast sight picture in low light. Click-adjustable for windage and elevation, so you can dial in your load.
• Double/Single-Action with Exposed Hammer: Why it matters — run it double-action for defensive speed, or thumb-cock the exposed hammer for precision single-action shots. The trigger on these K-Frames is legendary for a reason.
• Drilled-and-Tapped Frame: Why it matters — if you want optics or a red dot, the frame is already drilled and tapped. No gunsmith needed to mount a reflex sight for faster target acquisition.

Who It’s For

This revolver is for the collector who wants a stainless classic that still sees range time. It’s for the shooter who appreciates the K-Frame’s balance and the .357 Magnum’s versatility. If you’re a gun show regular or a revolver enthusiast looking for a do-everything stainless wheelgun, the Model 66 fits your hand and your safe.

Pros & Cons

• Pro: Stainless finish is low-maintenance and holds up to holster wear. The 4.25-inch barrel gives you a great balance of accuracy and carryability.
• Pro: Adjustable sights are a huge upgrade over fixed sights — you can zero for your favorite .357 load or .38 Specials.
• Con: The factory synthetic grip is functional but not as comfortable as aftermarket wood or rubber for extended shooting sessions with full-power .357 loads.

Comparison

Feature	Smith & Wesson Model 66	Ruger GP100	Colt Python
Frame	K-Frame (stainless)	GP100 (stainless)	I-Frame (stainless)
Barrel Length	4.25″	4.2″	4.25″
Capacity	6 rounds	6 rounds	6 rounds
Weight (unloaded)	~35 oz	~40 oz	~42 oz
Sights	Adjustable white-outline rear, red ramp front	Adjustable rear, fiber optic front (on some models)	Adjustable rear, red ramp front
MSRP	$987.50	~$949	~$1,599

FAQ

What is the barrel length of the Smith & Wesson Model 66 .357 Magnum Revolver?

The barrel is 4.25 inches, measured from the front of the cylinder to the muzzle. That’s the standard length for this model as of current production.

Is this revolver compatible with .38 Special ammunition?

Yes. The Model 66 is chambered for .357 Magnum and will safely fire .38 Special and .38 Special +P rounds. You can shoot the milder .38 loads for practice and carry full-power .357s for defense or hunting.

Does this model have an exposed hammer?

Yes, it has an exposed hammer for single-action cocking. It is not an internal-hammer or shrouded-hammer design, so you can thumb-cock it for precision shots.

What is the finish on the Smith & Wesson Model 66?

It has a matte stainless finish. This is a low-glare, corrosion-resistant surface that looks good and hides holster wear better than polished stainless.

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Last updated: April 2026

According to NSSF data, revolver sales accounted for over 15% of new firearm purchases in 2025, with the .357 Magnum being the most popular revolver caliber among collectors.

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