629-5 PC question

[caelo4]

I was pulling the side plate for a thorough cleaning the other evening. Pulled all the internals as I've done on a few other S&W revolvers, and there is this piece laying on the cleaning mat that I don't recognize. I've put the revolver back together and it functions perfectly. Any idea what this part is from/to? Am I an idiot and didn't put it back together correctly?

Thanks for the help.

Hopefully y'all can see the pic.

 

[caelo4]

Here is a different view.

 

[Fullmetaljacket]

That is called the "bolt block" I believe and was part of the endurance package of modifications introduced sometime during the 29-3 production. 29-3's with the endurance features were stamped 29-3E. The endurance features included radiused studs, something called a "floating hand", bolt block and longer stop notches in the cylinder. I'm a little fuzzy on the details but I think those features were phased in over the 29-3E, 29-4 and 29-5 with all of them being present on the 29-5. As I understand it regular use of full power .44 mag loads used in 29-3's in silhouette matches sometimes caused the cylinder to unlock and rotate backwards, the endurance features rectified that. I'm not clear on exactly how the bolt block functions. I had my 29-5 apart yesterday and looked at it. It's nothing more than the part in your pic riding within a slot milled into the frame. It drops right out as you discovered.

 

[caelo4]

You are a life saver, thank you very much for the help.

 

[ultratec00]

When assembling, slot is facing up. I always put a drop of CLP in the channel prior. Keep in mind the trigger moves the block up during double action and/or when the hammer is pulled back for single action. You need to make sure the protruding pin on the trigger goes into the slot when reassembling.

 

[BLUEDOT37]

Cylinder bolt block

I'm not clear on exactly how the bolt block functions.

For those who haven't seen where the part goes or how it works:

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Bolt block disengaged, hammer not cocked: cylinder release can function normally



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Bolt block (lower arrow) in engaged position; cocking the hammer slides it up: the cylinder release bolt (upper arrow) cannot move forward & accidentally unlock cylinder during firing.



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