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  #1  
Old 02-15-2010, 04:08 PM
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Default Tell me about the 940 and 9mm revolvers in general

As a fan of 9mm auto pistols, I am a big believer in consolidating calibers, so the S&W 940 has interested me for years. However, I never see one for sale and assume they must be scarce indeed. For those in the know, I have the following questions: how long was the 940 produced, and is there a gunsmith who can convert a J frame S&W to shoot 9mm ammunition?

Thanks in advance for your thoughts / assistance.
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Old 02-15-2010, 04:27 PM
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the 940 was made from 1991 to 1998 there is gunsmiths that can make ur gun 9mm some of them cut the cylinder on 38s and 357s to make them shoot 9mm and people have been puting 940 cylinders in there guns

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Old 02-15-2010, 05:13 PM
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I just got my 940 in December. It seems you really have to look for them. I have never just come across one at a gun shop. I found mine on Gunbroker. There are gunsmiths that will ream out the chambers of nearly any 38/357 to accomodate a 9mm with moonclips. I have seen the cost between $200 and $250 for S&W J frames. Forum member HEADKNOCKER has one that he had reamed and seems to like it. Its not really any cheaper if you have to buy the 38 special and then pay to convert it than it is to just pony up the cash for a real 940. If you already have one that you want to convert, then you can save some money there.
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Old 02-15-2010, 07:00 PM
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I have a clutch of wheelguns that shoot semi-auto rounds; 9mm, 10mm, .40 S&W and of course .45 ACP. The short auto cases frequently are easier to eject fully from a snub with a short ejector rod, particularly true of 9mm and .45. Of course both of those rounds come in a whole lot of loadings, different bullet types and so forth, so selecting the right round for your purposes is easy. The 9mm is a nice snub load and you can get mild or fire breathing loadings from lots of ammo builders. The 40/10mm revolvers can really put out a hot round, particularly in the Smith 610. The 646 is an easy carrying service size gun due to its lightweight cylinder.
The real advantage for a service or HD revolver in an auto caliber is the quick reload with moon clips, also you can get some flexibility in caliber in the same cylinder, I have a 627 with 3 cylinders, with one cylinder I can shoot .357 Magnum, 9mm, .38 Super, 9X21mm, 9X23mm, .356TSW and even .380 auto-if one wanted to shoot such a lightweight out of a 627. I even have a Browning revolver (a Barracuda) that has interchangeable cylinders in .357/9mm.
My usual duty weapon is a Browning HP so my 940 makes a perfect BUG, carried in the off side pocket it draws easily from a pocket holster and can be reloaded if necessary by using the HP mag to feed the rounds into the cylinder-of course without a moon clip you will have to pick the empties out individually. Usually I carry 2 moon clips in a single small speedloader holder stacked one over the other.
The S&W 547s do not need nor can they use moon clips, they have an interesting extraction system that works well and HKS makes speedloaders for the 9mm for that gun. The 3 inch 547 makes just as great a carry gun as its K frame relatives the M10, 64 and 65.
I am currrently having an M60-4 and a 37-2 fitted with 940 extra cylinders, the 37-2 cylinder will be refinished to match the gun, thus giving me a lightweight J frame in 9mm, which is not otherwise available. I would do a 637 too, but I was able to get only 2 extra 940 cylinders.
The 37-2 just may replace the 940 as BUG and off duty revolver. Lately 9mm has been cheaper to shoot that .38 special, so I can get in range time even through the ammo crunch, which appears to be loosening up some lately.
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Old 02-15-2010, 07:09 PM
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I had one of the early 940s. It was a disaster. I bought it because it seemed like a great idea to be able to use full moon clips for fast reloads and because I liked the idea of a 9mm in a snub. It would not eject the spent cases unless I took a small hammer and tapped on the ejection rod. I talked with S&W and they said I was using the wrong ammo but it happened with every brand I tried . After sending it in a couple times they called and asked if I wanted to trade for the 357snub. It turned out to be a great gun. It does sound like they have worked the bugs out ( pun intended) since I don't read complaints about the 940 on this blog.
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Old 02-15-2010, 10:03 PM
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Interesting responses - thank you, gentlemen. Who can I approach to have a J frame converted to 9mm? I say this as I have about given up on ever finding a 940 for sale....
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Old 02-15-2010, 10:56 PM
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If you don't absolutely have to have a J-frame, the Ruger SP101 was also produced in a 9mm model. It, too, is discontinued and is somewhat hard to find.

TMann
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Old 02-15-2010, 11:31 PM
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I have a couple of Speed Six Rugers chambered in 9mm. Have had a couple of SP101's, also. More of an investment for me that shooters.

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Old 02-16-2010, 01:19 AM
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Default Patience...

All due respect, but you just need to wait a bit, I saw a 940 on Gunbroker.com in mid January, and I have seen them before as well. If you can wait, they are out there. That said, the guns (940) seem fine, but I hear the moonclips can wear out (get bent) after a few uses, they are the weakest link, not the gun. Keep checking gunbroker and gunsamerica, and you will find it, happy hunting.

S&W Smith & Wesson 940 NO DASH 9mm J Frame 640 : Revolvers at GunBroker.com

940 sold for $765 on 1-13-10
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Old 02-16-2010, 01:38 AM
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940s are great guns and can be found..
I came arcross both the ones I had when not looking for them..
The one I still have I found with only a couple of minutes left at a 2100 table gunshow on Sunday, The guy took it in trade & wasn't happy, I ended up tradeing a SP101 & got $100 to boot on the trade
I paid $175 for the SP101 so I figure I have $75 in the 940..
The second one I paid $550 cash at a small gunshow in Cave City, I later traded that one to another forum member here..
I had my cylinder reamed to accept the longer cartridges & haven't had any sticking case troubles except Winchester White Box which the 940 just doesn't like..
Anyone who is haveing sticking case troubles with the 940 needs to look inside the cylinders chambers with an eye loupe & I'll bet you see mill marks from the reamer, If so these can be smoothed out useing the Brownell's Flex Hones which I have two sets of & can loan to any forum member who pays the $5 Priority S&H..
940s also seem to have been made at a time when S&Ws quality control was in order & most have the smoothest slickest actions of any DAO revolver you'll ever handle, My personal 940s trigger pull is less than 5lbs & slick & has never had a failure to fire..
Keep an eye out & eventualy you'll come across one..
Good Luck!!
Gary
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Old 02-16-2010, 02:33 AM
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Don't flame me if I'm wrong, but what about the model 547? IIRC they don't require moon clips. That seems to be more a collector piece than the 940, but the OP may still be interested.
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Old 02-16-2010, 05:12 AM
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I would be patient, they show up when you least expect it. Gunbroker has one 2" M940 and two 3 inchers listed right now. There are also three M547's listed currently. Oddly enough, all three of the M547's are 4" square butts. They are definitely more of a duty weapon. All the ones you find on national auction sites, however, are going to go for a premium. You would be better off finding one locally. A lot of gun shops don't realize what they have and price them the same as a used 38sp J-Frame (the M940 that is). There are a lot of stories on here like that. Mine is one. Be patient.
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Old 02-16-2010, 08:12 AM
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I bought my 940 with 30 moonclips from Cabela's for $299 about a year ago. I wasn't looking for one and just happened to see it. Mine is a Dash Nothing. The only ammo that will not readily extract is that which is loaded with inferior, soft brass or some of the +P and +P+ stuff that is loaded with too fast a powder. All standard pressure ammo from all reputable American manufacturers extracts just fine. Through careful handloading I can get 124 gr. cast bullets going to a verified 1230 FPS with easy extraction, which is not bad from a 2" barrel. Mine also has a very smooth action which fires any and all primers. As far as 2" barrel J Frames go, it's probably the heaviest that was ever made and many shooters don't like that. I do not mind it at all. Mine is very easy to shoot, even with the heaviest loads. It is also one of the most accurate handguns I have ever shot, producing offhand groups at 25 yards that are smaller than most service grade revolvers and autos I have tried. All considered, this revolver is best purchase I ever made.

Dave Sinko
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Old 02-16-2010, 12:46 PM
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David is right about the 940 being heavy compaired to a 640-0
The barrel is heavier & the cylinder has more meat ahead of the cartridges..
I'll have to say that my 940 has the slickest action of any DAO revolver I've ever seen, If they were all like this they wouldn't have any trouble selling them for sure..
I'll find a 3" M547 one of these days when the finacial advisers grace me with thier presence again..
Untill then I'll have to keep my 940 & 642/942 & shoot lots of 22lr from my Ruger MKII & 10/22..
Gary/Hk
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Old 02-16-2010, 01:13 PM
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They are out there. I just bought one off Auction Arms 2 weeks ago. Paid a little more than I wanted, but as you have seen, they don't show up every day. I was actually looking for a Mod 34 at the time, but the 940 sucked me in. It has a very smooth action, almost as good as my Mod 60 which I have worked over. I just ordered a set of grips, Spegel's high horn, from our buy/sell forum. I don't care for the Uncle Mike's grips they come with.

Dave, what load do you use to get the 1230 fps. Do you have a good cast bullet load, in the 124 to 147 grain range?
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Old 02-16-2010, 01:27 PM
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Default 547

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Originally Posted by Swabby View Post
I would be patient, they show up when you least expect it. Gunbroker has one 2" M940 and two 3 inchers listed right now. There are also three M547's listed currently. Oddly enough, all three of the M547's are 4" square butts. They are definitely more of a duty weapon. All the ones you find on national auction sites, however, are going to go for a premium. You would be better off finding one locally. A lot of gun shops don't realize what they have and price them the same as a used 38sp J-Frame (the M940 that is). There are a lot of stories on here like that. Mine is one. Be patient.
"SPF" I have a 547 3" listed on the forum for sale right now and if anyone is interested I will email pictures.

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Old 02-16-2010, 04:41 PM
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Guevera,
I have a "937", a 637 that was converted to 9mm by TK Custom. Tom cut the cylinder for moonclips and rechambered from .38 Special to 9mm. Total cost was $225 and turn-around time was 10 days. There are other custom shops that do the same thing; this is just the one I used.

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Old 02-17-2010, 12:27 AM
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Guess I'll post a pic of mine again, since we're on the subject. For those that haven't seen it, it's a scandium framed 360J rechambered to 9x23, among other work, by Pinnacle High Performance. I usually load it with 9mm +P+. It is accurate, very light, and a pleasure to carry and shoot.

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Old 02-17-2010, 11:57 AM
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I carried a 940 on my ankle for about 15 years. Had the issued Federal BPLE +P+ 115's in it. Had a Tyler T and the original smooth stocks on it. Great gun. The 547 doesnt like the hot 9's too much. I keep some non +P gold dots in it.
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Old 06-01-2010, 11:06 AM
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Also today I noticed that on Gunbroker a couple of revolvers in 9mm are for sale - if you're willing to try a Ruger Speed Six...
I recently bought a 4 inch Speed Six, but it's a 38 Special.
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Old 06-01-2010, 01:11 PM
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Default 547

The 547's have the advantage of not needing moonclips, there is a very sophisticated extractor system. In addition, the size and weight of a 4" K frame handles the snappiness of the 9mm round a lot better than a J frame. However, the one I had, the trigger was not much fun, no where near as smooth and nice as my 940. I agree with what has been said about the triggers on 940's generally, and the need for honing the chambers if you want reliable extraction. They are both out there, just have to be on the lookout.
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Old 06-01-2010, 03:51 PM
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I realize this thread is an old one but wanted to add that the 940 I had some years ago was a nice pistol but an obscene pain when it came to extraction. I was unable to get any ejection reliability from any of the budget or premiun 9mm ammo I could get. I carried a rubber mallet to the range to tap the ejector rod until I traded it for a 638.

I regret trading it now and would love to find another if the sticking problem could be corrected. I would prefer to have ammo commonality between my 9mm duty/off duty pistols and my pocket revolver.
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Old 06-01-2010, 07:44 PM
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That sad to hear!!
I too used to carry the rubber shot hammer to the range with mine too!!
The hones are available for anyone to use for FREE!!
I have them in 9mm/38/357, 41, 44 & 45..
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Old 06-01-2010, 07:55 PM
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If you re-chamber for 9mm can you still fire the .38 cartridge?


p.s. how's the recoil compared to the .38?

Last edited by 1 old 0311; 06-01-2010 at 07:58 PM.
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Old 06-02-2010, 01:09 AM
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No if you cut the chamber for 9mm it is slightly larger & if the 38 is then fired in it the cases will fire form to the 9mm cylinder & stick..
I've heard of some doing it but of course there was that problem..
9mm in a snubbie is snappy but managable, In my Airweight it's a pretty good whack to the hand but not as fierce as a 357 magnum from a 13oz snub..
The standard 9mm rounds do seem to have slightly more recoil than a standard 38spl, more like a +P 38spl..
I did my convertion by fitting a 940-1 cylinder to my existing yolk/crane & can switch back to the 38spl cylinder by just removing the end shake screw & swap cylinders, I had to fit the new 940 cylinder to the existing hand & shim the new cylinder with two .002" end shake shims.

Hope this Helps!!
Enjoy All!!
Gary/Hk

9mm Model 642 No Dash aka M942


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Old 06-02-2010, 09:05 AM
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^^^^^Good info. Thanks!
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Old 11-14-2013, 06:40 PM
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Hello, I had my 940 rechambered to shoot 9x23. Works perfect. I load it to 38 super loads. Because I don't like clips I took 38 special cases trimmed them to 23mm long and load. Perfect ejection.lots of power. I am retired law enforcement and carried for over 22 years.
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Old 11-14-2013, 06:52 PM
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There is a lad on Calguns.net offering a 547 for sale. He is asking $1500. Seems steep but it is a rare piece. K-frame, round butt, 3" barrel, what's not to love?
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Old 11-14-2013, 06:54 PM
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Quote:
Originally Posted by WC145 View Post
Guess I'll post a pic of mine again, since we're on the subject. For those that haven't seen it, it's a scandium framed 360J rechambered to 9x23, among other work, by Pinnacle High Performance. I usually load it with 9mm +P+. It is accurate, very light, and a pleasure to carry and shoot.

That's a real classy looking Rev. I seen that gun on this site.That gun is following me. lol
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Old 11-15-2013, 06:06 AM
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I still carry it just about every day. I had a some changes made a year or so ago, it's now DAO, added a trigger stop, had the hammer bobbed the rest of the way and polished, and had the IL disabled. It continues to be one of my favorite self defense guns.

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Old 11-15-2013, 07:54 PM
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I still carry my 940 on duty as a backup gun in a pocket sewn on the front of my body armor. But I don't carry it off duty. I recently bought a 340PD and the light weight allows all kinds of carry options not possible with the much heavier 940. But despite the hi tech scandium and titanium components of the 340PD, I feel that my 940 is still the better made revolver in the grand scheme of things.

The conversion cylinders are interesting but I don't want to give up the ability to fire 9x19 without moonclips. And I have not seen any actual chronograph data that shows that any .38 Super load will beat handloaded 9x19 out of a 2" barrel.

Dave Sinko
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Old 11-16-2013, 12:08 PM
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Quote:
Originally Posted by xraydave1 View Post
Hello, I had my 940 rechambered to shoot 9x23. Works perfect. I load it to 38 super loads. Because I don't like clips I took 38 special cases trimmed them to 23mm long and load. Perfect ejection.lots of power. I am retired law enforcement and carried for over 22 years.
This is an interesting thread, glad you resurrected it. I'm curious what dies you use to reload your shortened cases- 9x23?
It seems to me like the only advantage of your gun is the shorter-than-standard 38 spl cases will be easier to punch out of the gun in a hurry (no short-stroking). Otherwise, you might as well just load up some hot 38 spl's & use a standard 38 spl cylnder.
I'm intrigued by the guys who had their 37/637's re-cylindered or rechambered to 9mm. 9mm pressures are quite a bit higher than 38 spl- about halfway between 38+P and 357. I don't believe S&W has ever chambered an airweight (aluminum-framed) gun for 357, just the airlites (scandium). 9mm was chamberd only in steel (547) or stainless (640) guns.
According to SCSW, S&W did produce one prototype 642 9mm airweight back in 1999, but never put it into production. I dn't know if that was becasue they thought it wouldn't sell, or if they thought 9mm pressures might be too hih for an aluminum frame.
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Old 11-16-2013, 01:27 PM
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I used to own a 940, but foolishly sold it. I carry a 9mm Glock as my primary duty weapon, and bought the 940 for use as a backup. I had a few minor problems with sticky brass, but started using nickel-plated cartridges and the problem stopped.

Now, I'm getting interested in converting a 340 Sc I have to 9mm, if I can find a cylinder. I removed the titanium cylinder from it long ago, and replaced it with a stainless one, so I could send the stainless cylinder off to Pinnacle and have the conversion done, but I prefer to do my own work. If I find a 9mm cylinder, I can still swap back to .38/.357 using the titanium cylinder I still have (although I don't shoot .357 in it - it is confined to Buffalo Bore 1000 fps 158 gr., LSWCHP).

I'm going to retire next sumer, and plan to increase my stable of J-frames, as I suspect they will become my primary carry guns.
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Old 11-17-2013, 12:49 AM
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A 940 cylinder is too short for your 340 frame, I tried to fit one to my 360, no joy.
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Old 11-17-2013, 08:42 AM
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Quote:
Originally Posted by snowman.45 View Post
Now, I'm getting interested in converting a 340 Sc I have to 9mm, if I can find a cylinder.

If I find a 9mm cylinder,
IF is the operative word here. When I got my 940 it had extraction problems. I figured I could just buy a new cylinder. No luck. They are just not out there. Sure, you could run across one, but it's not like you can just go out a buy one anymore (unfortunately). I think the more practical way to do the conversion is to buy a .38 cylinder and have it milled. I'm not sure, but I bet that would be comparable in price to the cost of a 940 cylinder IF you can find one. Of course there's always the chance of finding someone who doesn't know what they have - either way, good luck.
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Old 11-17-2013, 01:30 PM
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I thought Cylinder & Slide used to do it as well as another, but checked their websites and saw no specific mention of this type of conversion. You might just have to call them. I have kicked this around for a while also, but with a 442/642.

I bought a new 940 back in the early 90s as part of my quest to find the perfect back-up. I was carrying a 9mm pistol at the time and thought that if my BUG also took my duty ammo it would be good. I recall the 940 had the heavy barrel profile while the 640s were tapered barrel. I don't know if this makes much difference. I got rid of my 940 after it locked up on me at the range. I had not fired a lot of rounds thru it, but had been to the range with it once or twice before and had experienced no problems. I had shot two or three cylinders of my +P+ duty round, and it worked fine. Then I tried some 147 grain Hydra Shoks that I had, and the thing locked up. I could not get the cylinder open for a while, and am guessing it opened after it cooled down. I could not see any reason for that happening at the time and did not think it seemed excessively hot. I took it back to the shop where I had made the purchase and they sent it back to S&W. When the gun was returned, S&W had not provided any paper documenting what work had been performed, if any and the shop could not tell me. I traded it for a .38 at that point. Hind sight is that I should have shot it again to see if it worked, especially considering what prices they're now commanding. For concealed carry and BUG, it was a great idea, but I did not care for the moon clips. They just seemed like they could get bend up trying to carry them in my pocket. I don't know if there were problems with the 547's extraction system, but if S&W had made that same feature available for the 940, it would have been great IMO.

Last edited by walkin' trails; 11-17-2013 at 01:35 PM.
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22lr, 357 magnum, 38spl, 547, 637, 640, 642, 940, airweight, browning, ejector, extractor, gunsmith, j frame, k frame, model 10, ruger, scandium, snubnose, speedloader, spegel, winchester

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S&W Revolvers: 1980 to the Present Thread, Tell me about the 940 and 9mm revolvers in general in Smith & Wesson Revolvers; As a fan of 9mm auto pistols, I am a big believer in consolidating calibers, so the S&W 940 has ...
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