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05-25-2017, 09:18 PM
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629-3 Mountain Gun Unusual Hand
I've owned a very large number of S&W revolvers since the early 60s but this 629-3 Mountain Gun is the first one I've seen with a hand that has an extended pin that fits into a sliding piece that moves up and down in a milled groove when the triggers is pulled.
Since this is my 1st 44 Magnum I'm wondering if this is unique to them or only this model.
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05-25-2017, 09:45 PM
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IIRC the "floating hand" was eliminated with the 629-3 revision,
Seem to recall the pin inside the rebound spring preventing trigger over travel .
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05-25-2017, 10:05 PM
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This is not a floating hand.
This hand has the pin that attaches it to the trigger protrude 1/8" out the back of the trigger and fits into the sliding piece in the frame groove that runs up to the bolt.
Look at the 1st photo on the left to see the piece in the groove and the photo of the trigger with the pin sticking out.In the 3rd photo the sliding piece is shown.
I've never seen this setup
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05-25-2017, 10:42 PM
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It's part of the endurance package to prevent the bolt from unlocking under recoil. When the trigger is depressed, the vertically oriented piece moves up to interupt the bolt.
Last edited by SLT223; 05-26-2017 at 12:46 AM.
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05-26-2017, 01:46 PM
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Here's some info I found once I knew what to look for on sixguns .com.
"In 1989 S&W began to add the Endurance Package to both the 29 and 629. Using high-speed photos, Smith & Wesson engineers studied the .44 Magnum under recoil and concluded that problems arose as various parts moved under recoil. The frame recoiled backwards and the cylinder pin did not. The result was the cylinder was free to rotate. Heavy recoil was causing the trigger to kick back and the hammer was bouncing and hitting the primer a second time resulting in two indents on the primer. The engineers went to work. Longer notches were machined in the cylinder so the cylinder stop could not bounce out under heavy recoil. A bolt block was added that keeps the bolt from transmitting movement to the trigger. All mounting studs for rebound slide, trigger, hammer, etc., were radiused where they attach to the frame as round corners are less likely to "tear" then sharp corners; all receiving holes were also radiused for the same reason. To help increase strength, the bearing surface on the cylinder yoke was increased and the yoke also received a new heat treatment. All of these improvements were phased into the S&W .44 Magnums in the late 1980s and those with the complete package have a noticeable longer bolt slot cut into the cylinder.
The first .44 Magnum to have all of these improvements was the Magna Classic."
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05-28-2017, 03:51 AM
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I originally only associated this feature to the 44 Magnum frames but I've also noticed it (the bolt block) in some of my other N-frames.
I don't have the info for the exact ones in front of me to state, but IIRC one of my 45 ACP revolvers & one of my two N-frame 357's has it (all made within the last 5-8 years). Maybe only the scandium framed ones?
Wonder why some non-44 Magnum revolvers have it? Anybody else notice this?
.
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05-28-2017, 04:44 AM
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Quote:
Originally Posted by BLUEDOT37
I originally only associated this feature to the 44 Magnum frames but I've also noticed it (the bolt block) in some of my other N-frames.
I don't have the info for the exact ones in front of me to state, but IIRC one of my 45 ACP revolvers & one of my two N-frame 357's has it (all made within the last 5-8 years). Maybe only the scandium framed ones?
Wonder why some non-44 Magnum revolvers have it? Anybody else notice this?
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Yes. It's just a standardized manufacturing process on the N Frame.
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05-28-2017, 04:55 AM
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Quote:
Originally Posted by SLT223
Yes. It's just a standardized manufacturing process on the N Frame.
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If it's a standardized process, then why isn't it on my 627-5 Pro? Not trying to knock what you posted, but just curious. It's not like it actually needs the bolt block.
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05-28-2017, 04:59 AM
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Quote:
Originally Posted by muddocktor
If it's a standardized process, then why isn't it on my 627-5 Pro? Not trying to knock what you posted, but just curious. It's not like it actually needs the bolt block.
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News to me. Quess Im wrong. I thought all n frames had the full endurance package.
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05-28-2017, 05:21 AM
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Quote:
Originally Posted by muddocktor
If it's a standardized process, then why isn't it on my 627-5 Pro? Not trying to knock what you posted, but just curious. It's not like it actually needs the bolt block.
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That was my point, it's not on all my modern N-frames, & not only on the 44 Mags. If it is only on the Sc N-frames (?) maybe it's just a safeguard because of their lighter weight & recoil? Maybe they use whatever they have readily available?
.
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05-28-2017, 11:26 AM
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Bolt Block:
625-2 Model of 1988(N)1989 = No
629-3MG(N)1993 = Yes
686-3(L)1993 = No
686-4(L)1995 = No
696-0(L)1996 = No
21-4(N)2007 = No
EDIT: Does the L Frame Model 69 44 Magnum have the endurance package?
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Last edited by StakeOut; 05-28-2017 at 11:37 AM.
Reason: added info
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05-28-2017, 01:07 PM
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Quote:
Originally Posted by SLT223
It's part of the endurance package to prevent the bolt from unlocking under recoil. When the trigger is depressed, the vertically oriented piece moves up to interupt the bolt.
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I've never heard this before???
Steve
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05-28-2017, 02:12 PM
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Endurance Package
Quote:
Originally Posted by S.B.
I've never heard this before???
Steve
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This is correct. My 629-4 has the complete Endurance Package.
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05-28-2017, 02:22 PM
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What SLT223 said. My 629-1 does not have it but my 629-5 MG did.
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05-28-2017, 03:35 PM
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Quote:
Originally Posted by D Brown
This is correct. My 629-4 has the complete Endurance Package.
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Yes sir, I have no doubts at all. Just, I've never seen such before.
Steve
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05-28-2017, 03:41 PM
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I believe that the endurance package is on the 45 Colt models from the 25-9 on.
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05-28-2017, 04:32 PM
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I believe it was before this?
Steve
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05-28-2017, 06:10 PM
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My 629-6 has this. My 625-6 JM does not. Haven't popped the side cover on my 69 2.75" yet but it does not seem to have deep cylinder notches.
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05-28-2017, 06:38 PM
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I was under the impression 69 were an L frame not N also, engineering changes aren't necessarily the same for different models.
Steve
Last edited by S.B.; 05-28-2017 at 06:39 PM.
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05-30-2017, 12:48 AM
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Quote:
Originally Posted by StakeOut
Does the L Frame Model 69 44 Magnum have the endurance package?
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Doesn't have the bolt block nor the enlongated cylinder stop notches. None of the L-frames.
.
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Last edited by BLUEDOT37; 05-30-2017 at 12:49 AM.
Reason: .
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05-30-2017, 11:03 AM
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Quote:
Originally Posted by S.B.
I was under the impression 69 were an L frame not N also, engineering changes aren't necessarily the same for different models.
Steve
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Logic would tell me that the endurance package would be as necessary in a 44 Magnum L frame if not more so than in the larger N Frame but who knows what Smith incorporated into the Model 69 design that made it different firing full house 44 magnum loads.Could be just to keep production costs down and thinking not many owners are going to shoot full house loads in their Model 69 especially the 2.75"?
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