Smith & Wesson Model 640 Pro Series: Part I

640 Pro Series

My daily carry gun for the past year has been the Smith & Wesson 640 Pro Series. This J-Frame .357 Magnum offers many features not seen on other guns in its size-class. In Part I of this review I am going to discuss the gun itself, in detail. In the next part I am going to cover the piece’s range performance and actually carrying it – a task at which I have fairly considerable experience. Disclaimer: My apologies for the dirt, dust, and scratches on this piece. She has earned those marks honestly.

640 Pro Series Features

First off, the boring stuff: the S&W 640 Pro series is an all-stainless steel, 5-shot, double-action only, J-Frame revolver in .357 Magnum. The gun has a 2 1/8″ barrel and weighs in at 22 ounces. The 640 Pro has a suggested retail price of $839 – a fairly handsome sum for a J-Frame. The reason for such a high asking price? The 640 Pro is assembled by the Smith & Wesson Performance Center and has a pretty significant feature set.

640 Pro Series

From a standpoint of pure functionality, the biggest improvement to this revolver over more pedestrian J-Frames is the addition of sights that are actually usable. Not only are they usable, the are actually night sights! This is unheard of on a factory snubby and was one of the single biggest selling points for me. Though I would prefer a configuration other than the three-dot arrangement, I’m really glad to have it.

640 Pro Series

This revolver is of the “hammerless” design. There is no exposed external hammer. This seals the back of the gun, where it is most likely to take on dirt, grit, and grime. It also eliminates the risk of the useless (for self defense) hammer snagging on your clothing when drawing the weapon. And though it is completely subjective, I really like the clean lines of this design.

One of the 640 Pro’s major selling points for me – and one that Smith & Wesson doesn’t advertise heavily – is the lack of the internal safety. Though problems with these safeties seem to have receded (or at least receded from public consciousness) in recent years, I don’t like the needless complexity they add to the gun. I also don’t like their unsightly appearance. Thankfully there are still a few revolvers being manufactured without the ugly keyhole above the cylinder release latch.

640 Pro Series

Another nice feature of  the 640 Pro Series: the cylinder is pre-cut to accept moon clips and the gun ships with three of them. Though it is doubtful that many individuals will carry a spare moon clip as a reload, this is still a really cool feature. Even if you don’t carry reloads in a moon clip, you may want to carry one in the gun. It aids in positive ejection of empties by ensuring they all come out en masse. It also ensures the extractor star has something very big to push on and eliminates the chance of stuck brass or brass under the extractor star.

640 Pro Series

The barrel of the 640 Pro Series has something of a unique profile. It is blended smoothly with the frame and sports a full underlug. The underlug is also gently tapered at the muzzle end. This cuts a rather distinctive profile as well as (perhaps) making the barrel a little easier to slip into a holster. The front-sight pedestal is also rather bold, especially for a J-Frame. It is dovetailed for the front sight which allows windage adjustment – again, something almost unheard of on a J-Frame. Perhaps the most visually arresting feature of this little barrel are its flutes. The utility of these is debatable, except perhaps as a weight-saving measure. Regardless, I find the fluting an interesting design decision and an aesthetically pleasing touch.

640 Pro Series

The 2.125″ barrel offers another major benefit over the more typical 1.875″ tubes: the use of a full length ejector rod. This aids greatly in positive ejection of spent cartridge cases. The standard J-Frame rod is significantly shorter. It is the little touches like these that make this revolver worth its asking price – at least to me.

640 Pro Series
Whether those flutes actually do anything or not, that is one sexy barrel!

I chose to modify this gun slightly (hey, nothing is perfect, right?) from its factory configuration.  The first modification was the installation of the grips you see on the gun: Tactical Diamonds from VZ Grips. I also installed the Duty/Carry Spring Kit from Apex Tactical Specialties.  I’ll cover both the grips and the spring kit in upcoming articles.

Stay tuned for Part II of this series. I’m going to talk about shooting and carrying the 640 Pro Series, the holsters I use with it, and the ammo I load it with.

Liked it? Support RevolverGuy on Patreon!

Become a Patron!

Author: Justin

Justin Carroll is a former MARSOC Marine and veteran of both Iraq and Afghanistan. Leaving service after eight years in the U.S. Marines, Justin continues his involvement with a variety of government agencies to this day. Justin began in late 2016 with an simple idea: provide an source of high-quality information for revolver enthusiasts.

6 thoughts on “Smith & Wesson Model 640 Pro Series: Part I”

  1. I have owned 1 for over 15 yr and love it carry great with the Wright leather on your side you can not tell you have it on you sent mine to magnaport and had the barrel ported looks great shots super jdjm

  2. Thank you for this article.

    Very helpful in my decision making process for purchasing a J frame for concealed carry.

  3. I’ve carried my S&W model 640 357mag for about 2yrs and so far its the best concealed carry yet, More than enough power, lightweight and pretty accurate.

  4. The S&W model 640 is a superb revolver. I was employed as a Special Agent by the United States Customs Service for many decades and was a firearms instructor for most of that time. The service issued the S&W 640 as a back-up or off duty gun.
    This firearm was extremely well made, heavy too, for a snubby. Man, was it accurate! If you know how to shoot a DA revolver then this is your gun. Beautiful smooth action, sights even on the early models was adequate. Because of my age, I have a background in L.E. revolver lore. I know a good wheel gun when I see one and this little powerhouse is one of the best I ever used.

    1. Dan,
      You just posted our 3,500th comment! Thank you!

      And thank you for writing in to tell us about your experiences with the S&W 640. I agree – the 640 is a great gun, and the 640 Pro is an excellent improved model. Thanks again!

Comments are closed.