K-Frame hands; 2 pin and 3 pin

[OutWest50]

Among my spare parts bin, I have both 2 pin and 3 pin hands for K-frames. I checked three of my K-frame guns to see what was installed. The Model 17-3 has a 2 pin hand, the Models 19-4 and 65-2 both have 3 pin hands installed. FYI, all of my spare N-frame hands are the 3 pin variety.

I cannot see a good reason for the "third" pin/post and assume that either will work in any K-frame from that era. Does anybody have any further information?

 

[Fastbolt]

Among my spare parts bin, I have both 2 pin and 3 pin hands for K-frames. I checked three of my K-frame guns to see what was installed. The Model 17-3 has a 2 pin hand, the Models 19-4 and 65-2 both have 3 pin hands installed. FYI, all of my spare N-frame hands are the 3 pin variety.

I cannot see a good reason for the "third" pin/post and assume that either will work in any K-frame from that era. Does anybody have any further information?

In my revolver armorer class we were told that the 3rd pin (middle of hand) is called the Bolt Block Pin. It was designed for use with Magnum loads. It blocks the bolt's forward movement, preventing the cylinder from opening under heavy recoil. It was developed in .357MAG models.

 

[Mercury]

You are right; from my experiences with them, either will work in a K-frame from that era.
I believe that the third pin was added to lock the bolt so that the cylinder wouldn't open when the hammer was cocked. But, someone more knowledgeable than me should be along shortly to confirm.

 

[OutWest50]

Ok thanks; I appreciate the information. That makes sense now.

 

[Fastbolt]

J-Hands I have in parts.

 

[Hondo44]

You are right; from my experiences with them, either will work in a K-frame from that era.
I believe that the third pin was added to lock the bolt so that the cylinder wouldn't open when the hammer was cocked. But, someone more knowledgeable than me should be along shortly to confirm.

Actually the cyl release and rear locking bolt positions prevent cyl from opening when hammer is cocked. As Fastbolt posted, the 3rd pin blocks the rear bolt when hammer drops upon ignition and recoil.

 

[Mercury]

Thanks, Hondo and Fastbolt, for explaining what the third pin is for.

 

[Beauetienne]

Great info!
Am I to assume that a '55 Combat Masterpiece could use either?
Thanks.

 

[armorer951]

Yes, but a clearance cut or slight modification may have to be made on the bottom front edge of the front bolt shoulder to accommodate the passage of the 3rd pin of the newer hands as they move up into position in front of the bolt, as the trigger moves to the rear. (not always needed)

 

[Hondo44]

The Bolt Block Pin on the hand would never be required on a 22. If later versions have it, it's most likely to simplify parts inventory.

I can understand the need on the J frames because such light guns have more recoil even with just 38 Spl.