Replacing a cylinder on a Smith & Wesson Model 17 is a task that ranges from a simple parts swap to a complex mechanical fitting process. Because revolvers rely on precise "timing" to ensure the cylinder chamber aligns perfectly with the barrel, this isn't always a "drop-in" procedure.
Based on the Smith & Wesson K Frame Cylinder you are currently viewing, here is what you need to know:
1. Removal of the Old Cylinder
To remove the existing cylinder and crane (yoke) assembly:
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Ensure the firearm is unloaded.
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Use a hollow-ground screwdriver that fits the yoke screw (the forward-most screw on the right side of the frame) perfectly to avoid marring the finish.
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Remove the screw and its internal plunger/spring (if applicable to your specific dash-model).
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Open the cylinder and slide the entire yoke and cylinder assembly forward out of the frame.
2. Swapping the Cylinder on the Yoke
To get the old cylinder off the yoke:
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You will need to unscrew the ejector rod.
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Crucial Note: Older S&W models have right-hand threads, while newer ones (typically post-1961) have left-hand threads.
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Use a dedicated ejector rod tool or padded pliers to avoid damaging the rod. Place empty casings in the chambers to support the extractor star while turning.
3. The "Fitting" Reality
While the part you are looking at is a Genuine S&W Factory OEM Cylinder, it is rarely a simple "plug and play" fix. A gunsmith usually needs to check and adjust the following:
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Timing: Ensuring the hand rotates the cylinder far enough to lock before the hammer falls.
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BC Gap: The distance between the front of the cylinder and the rear of the barrel.
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Headspace: The gap between the cylinder rear and the frame's firing pin hole.
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Range Alignment: Using a match rod to ensure the bore and chambers are perfectly concentric.
⚠️ Safety Warning
As noted on the product page, professional gunsmith installation is required. If the timing is off by even a fraction of a millimeter, the gun can "shave lead" or, in worst-case scenarios, cause a catastrophic failure.
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