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Old 10-17-2020, 04:44 PM
georgek472 georgek472 is offline
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Looking to fit a Mod 48 .22 mag cylinder to a Mod 17 3/8".22 L.R. cylinder revolver. The best of both worlds. Will it work..Your knowledge and experience is welcomed. Thanx George K ...
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Old 10-17-2020, 05:07 PM
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George,

I fit a new production model 648 cylinder to my 60's era model 17. The new cylinder came from Numrich's with a new, uncut extractor.

Fitting included a new center pin and cutting the new ratchets, but otherwise, tolerances were spot on and everything went very smoothly. I couldn't find a new model 48 cylinder, or afford a new or used model 48 at the time. (or now)

Amazing that the tolerances have not changed one iota over the approximately 60 year time span represented here.


Certainly no problem telling which caliber the gun is set up for now.......



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Old 10-18-2020, 01:50 PM
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Armorer951,
Thank you for your knowledgeable answer. I have heard several different scenarios as to fitment. From cylinder bore too small, barrel and forcing cone too tight, and lockup. Good to know a 686 cylinder will fit. Nice Look. Did you have to do anything with the yoke and ejector rod and star ??? I would love to try this approach based on your hands on experience.. I will look for a cylinder in .22 mag. NICE JOB on that project, Congrats.!! I wish I had that kind of knowledge...Would S&W sell me a #686 cylinder with rod and star. ??? Any help and advice will be greatly appreciated.. Thanx again for your help... Best; George K.
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Old 10-18-2020, 01:53 PM
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Sorry.. 648... And thanx again..
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Old 10-18-2020, 02:01 PM
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I'm not sure if S&W would provide and fit a new 648 .22 Magnum cylinder to your existing model 17. I doubt if they would, since the finishes don't match, and production "convertables" per se, were not offered, as far as I know....although there are probably some floating around. Numrich has the new cylinders in stock. The new cylinder will come with a new uncut extractor.

My model 17 is an older one, but there were no problems at all with the yoke or the cylinder assembly. Fitting only involved minor tweaking of a new center pin, and cutting the extractor ratchets to fit. The old extractor cannot be placed into a new production cylinder due to the design changes in the extractor itself. Any trained and experienced gunsmith could fit the 648 cylinder for you.....for a small fee, of course.
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Old 10-18-2020, 08:56 PM
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Thank you for your help and information..My Model 17 is also early production... I found the s/s cylinder at Numrich new. What other parts should i need.?? Spring, collar etc. What has to be done to the extractor ratchets and new center pin ?? Does the extractor rod have to be shortened or the one that comes with the cylinder will fit properly ??"8 3/8 barrel fitment. I will have to find a machinist to cut the extractor ratchets.. Thanx...George K.
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Old 10-18-2020, 08:58 PM
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Your response to S&W doing the work makes sense..
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Old 10-18-2020, 09:24 PM
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You will need a new center pin, since you have an older model 17. The shoulder on the newer center pins is in a slightly different position, so the old pin won't work properly in the new cylinder. The OAL of the new center pin will also have to be fit to the front locking bolt. (for proper length)
All of the other parts, including the extractor rod, extractor rod collar, and the springs should work fine with the new cylinder.

The ratchets on the new cylinder's extractor will have to be cut (fit) to work properly with your particular gun. I would recommend finding a good, reputable, revolver gunsmith to fit the extractor as the work requires special tools and considerable experience.
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Old 10-19-2020, 03:25 PM
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Thank you again for your help... Best...George K.
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Old 10-23-2020, 05:24 PM
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ARMORER951...Called S&W today regarding fitment for a #648 .22 mag cylinder to a #17(.22lr). Too much liability for them to do the fitment..Not interested.... Are there any members in the forum who can do this fitment with the knowledge, experience, and tools for this project.?? I have to find a knowledgeable gunsmith, so I will start here on the Forum first. Thought you might have someone you know in the Forum who can do the fitment..... Thanx again... George K.
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Old 10-23-2020, 06:20 PM
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George,

I'm not aware of anyone here on the forum doing this sort of conversion. My recommendation would be to call several of the reputable gunsmiths and shops to see if they think it's feasible, and to get an estimate of the cost for the work.

I would check with Mark at Pinnacle High Performance, Cylinder and Slide, Hamilton Bowen, and Clark Custom. Perhaps some other members here on the forum will have more information for you.

If you decide to have the work done, please let us know how the project turned out. Thanks.

Carter
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Old 10-23-2020, 06:45 PM
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You could also try Andy Horvath in Lagrange, Ohio.
440-458-4369
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Old 10-23-2020, 07:16 PM
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Thank you all for your responses
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Old 10-26-2020, 04:11 PM
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armorer951
Carter,
Was your 648 cylinder 6 shot or 8 shot..recessed ???? S&W made both.. Thanx again George K.
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Old 10-26-2020, 04:51 PM
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It is the new production 6 shot from Numrich. Comes with a new, uncut extractor. All of the .22 cylinders are recessed.

Cylinder, .22 Mag, 6 Shot, Stainless (w/ Extractor) | Gun Parts Corp.
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Old 10-26-2020, 05:22 PM
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Bob Cogan is in AL, so it wouldn’t cost an arm and a leg to ship it to him.

Accurate Plating & Weaponry | Gunsmith In Newville, Alabama
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Old 10-26-2020, 05:34 PM
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Thank you Carter,
I called Numrich and was told the 648 cylinders are 1.61" long and the older 17 recessed and 1.68"long, So the newer 6 shot S/S cylinders are shorter.... Confused.. 648 S/S cylinders are recessed ??? Diameters the same...1.44" And you had no problem with lockup, headspace, and cylinder gap ??? I would suspect the shorter length of the 648 takes up the difference on the rim of the cartridge...Just a wild guess (probably wrong). But if the 648 cylinder is recessed my theory is wrong... Thanx... George K.
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Old 10-26-2020, 09:04 PM
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I'm doing the same modification that Carter did to his Model 17 to my pre-18. The only real problem I ran into was the diameter of the gas ring on the new 648 cylinder was larger than on my pre-18 and so I filed the barrel flat on the bottom of the barrel to gain clearance. Other than taking .002 off the yoke tube of the pre-18 it became a drop in fit. That .002 is easily taken up with a .002 shim in the pre-18 cylinder. I'm waiting for my new center pin, extractor rod, collar and springs to show up and then I'm going to cut the ratchets. I'm really looking forward to having a convertible pre-18. In process photo below.

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Old 10-26-2020, 10:17 PM
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Amazing to me that the tolerances are still so close on these components after so many decades. One of the many things that make these guns so much fun to work on.
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Old 10-27-2020, 10:39 AM
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stu1ritter,
Nice work....... Best...George K.
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Old 10-27-2020, 11:01 AM
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George,

I'm puzzled about the statements that the Numrich rep made in terms of the specifications and length of the cylinder itself. My new 648 cylinder from Numrich measures 1.623". The cylinder in my 60's era model 17 measures 1.620". All of the "rimfire" cylinders, including the 22 magnum cylinders are recessed.

In terms of fitting, and aside from the gas ring discrepancy, the cylinders are basically the same. There is the added burden of individually fitting/cutting each of the ratchets, but other fitting issues that came up were easily accommodated, as Stu has stated above.

Carter
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Old 10-27-2020, 06:22 PM
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armorer951
Carl, Thanx for the measurements on the .22 LR and .22 Mag cylinders..You have answered my next question about cylinder measurements... I suspect the c/s reps at Numrich have limited information, maybe not. I have made progress on finding several Knowledgeable, hands on experience, and fairly reasonable gunsmiths who have done this procedure. The only problem they ALL had was the cylinder lengths from Numrich
648 mag 1.61"... LR..1.68".... Obviously wrong numbers from Numrich..Thanx for the response...Best; George K.
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Old 10-28-2020, 09:44 AM
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[QUOTE=georgek472;140943929]stu1ritter,
Nice work....... Best...George K.[
Stu,
Any thoughts on bore diameter .22lr vs..22mag. Thanx..George K
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Old 10-28-2020, 11:13 AM
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George,

Reference cylinder and pressure measurements, see post 7........


Impractical ?
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Old 10-28-2020, 02:02 PM
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Here are the spec's..........I haven't given it all that much thought.

.22LR Bullet dia. .2255, bore dia .217, groove dia. .222
.22Mag Bullet dia .2245, bore dia .219, groove dia. .224

I'm not too concerned.

Stu
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Old Yesterday, 01:43 PM
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Nice work....... Best...George K.[/QUOTE]
Stu,
Did you have to shorten the injector rod ?? Or the one that came with cylinder was the right length...Thanx.. George K
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Old Yesterday, 01:51 PM
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The cylinder came with the ejector and that was all. I had to order the ejector rod, center pin, collar, center pin spring and ejector spring (about $25.oo). I'll fit them when I get them this Saturday (according to Brownell's). Those are pretty simple to fit.

Stu
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Old Yesterday, 01:52 PM
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[QUOTE=stu1ritter;140945244]Here are the spec's..........I haven't given it all that much thought.

.22LR Bullet dia. .2255, bore dia .217, groove dia. .222
.22Mag Bullet dia .2245, bore dia .219, groove dia. .224

I'm not too concerned.


Thank you for your response.. This "hands on"info will go a long way.. Thanx..... George K.
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Old Yesterday, 01:56 PM
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Stu,
Thank you for the "hands on" numbers...They will go along way in my efforts....Thanx again....George K.
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Old Yesterday, 08:22 PM
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[QUOTE=stu1ritter;140946414]The cylinder came with the ejector and that was all. I had to order the ejector rod, center pin, collar, center pin spring and ejector spring (about $25.oo). I'll fit them when I get them this Saturday (according to Brownell's). Those are pretty simple to fit.

Stu, Thanx again for your help.... Please let me know when you can, about the ejection rod once you have it fitted. It would be nice to have the rod fit as is...Good luck with your install....
Best; George K.
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