anyone convert a S&W 642 to 9mm [Archive] - Glock Talk


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09-11-2011, 11:29
Curious if anyone has converted their 38 spl S&W 642 to 9mm?

How is the recoil in 9mm?


1 old 0311
09-11-2011, 13:13

Glenn E. Meyer
09-17-2011, 09:26
Discussed in detail on the SW forums. It has been done with 940 cylinders into other Js that would fit it.

09-17-2011, 10:50
I've owned a 940. The recoil is less, but is for lack of a better term more "snappy" or "quicker". I don't think 90% of people would notice the difference in a small steel J frame. Maybe on the 642 because of the alloy you'd notice it a tad more.

Once you step up to the 547 vs model 10 its completely noticeable.

The only reason to go to 9mm in a revolver is to take advantage of moon clips, for quick reloads. Other then that the 38 spl will do anything a 9mm will do.

12-17-2011, 17:23
My friend owned a 940. It was fun to shoot knowing it was a 9mm, but it's pretty pointless IMO.

Brian Dover
12-17-2011, 20:43
I had a S&W armorer/local smith order me a Model 940 cylinder. I fitted it up to a Model 637. It works fine either way. Most of my shooting with it is done with reduced power 9mm handloads; if carried for defensive use it's got 115 grain +P ammo aboard.

No idea if Model 940 cylinders are still available from the factory, cobbled mine together over 10 years ago. By the way that cylinder was oversized in a couple dimensions; I was able to (very carefully) fit it up myself but your mileage may vary as the saying goes.

08-17-2012, 13:14
My friend owned a 940. It was fun to shoot knowing it was a 9mm, but it's pretty pointless IMO.
I think the point is that an officer with a 9mm service pistol could carry a 940 (or the like) as a BUG and use his 9mm pistol magazines to feed reload rounds, if neccessary, giving him a revolver, as a BUG, as opposed to another semi, but maintaining the same caliber.
If a wheel gun doesn't fire, in a gut close encounter, where your off hand is occupied, simply pulling the trigger, will access a new round, where a pistold would require racking of the slide.
My 2.