Restore or maintain your classic wheel-gun with authentic factory replacement components for Smith & Wesson revolvers. MDs Gun Repair specializes in providing hard-to-find, factory-new parts tailored to specific S&W frame sizes—including compact J-frames, classic K-frame duty guns, heavy-duty L-frames, and large N-frames. From cylinder stop springs and hands to firing pins, we source reliable factory parts to keep your timing precise and your action smooth. Note: For safety and performance, we strongly recommend all revolver components be installed by a certified gunsmith.
Frequently Asked Questions About Smith & Wesson Revolver Parts
How do I know which frame size my Smith & Wesson revolver is?
Smith & Wesson builds its revolvers on standardized frame letters that dictate parts compatibility. [1, 2]
What causes a Smith & Wesson revolver to have a "soft" carry-up or timing issue?
If your cylinder fails to lock completely into position before the hammer falls, your revolver has a timing issue. This is usually caused by a worn cylinder hand, a degraded cylinder stop spring, or wear on the cylinder ratchet teeth. The hand pushes against the ratchet to rotate the cylinder; over thousands of rounds, the hand wears down and grows too short. Replacing it with a factory-spec hand or an oversized hand fitted by a gunsmith restores crisp cylinder indexing.
What is Smith & Wesson revolver "endshake" and how do you fix it?
Cylinder endshake is excessive back-and-forth horizontal movement of the cylinder inside the frame window. It is caused by wear to the cylinder crane arbor or the interior face of the cylinder. If left uncorrected, it leads to headspace issues or light primer strikes. Endshake is typically fixed by installing precision stainless steel crane shims inside the cylinder assembly or replacing a severely worn crane completely to restore proper barrel-to-cylinder gap.
Are older S&W revolver parts compatible with newer "dash" models?
Not always. Smith & Wesson indicates engineering design updates using a "dash number" stamped next to the model number inside the crane (e.g., Model 29-2 vs Model 29-3). Major historical revisions changed parts compatibility completely. Key shifts include the elimination of pinned barrels and recessed cylinders (P&R) in 1982, the transition from hammer-mounted firing pins to frame-mounted firing pins, and the introduction of the internal frame lock system. Always cross-reference your specific dash number before ordering internal action parts.
Why am I getting light primer strikes on my S&W revolver?
Light strikes on a double-action Smith & Wesson are usually caused by a backed-out strain screw, a fatigued mainspring, or a damaged firing pin. The strain screw located on the front strap of the grip frame controls leaf mainspring tension. If this screw backs out even half a turn, hammer velocity drops. If tightening the strain screw completely does not fix misfires, replace the old mainspring with a factory-weight replacement spring or check for a chipped frame-mounted firing pin.
How do I know which frame size my Smith & Wesson revolver is?
Smith & Wesson builds its revolvers on standardized frame letters that dictate parts compatibility. [1, 2]
- J-Frame: Small, concealable snub-nocks (Models 36, 60, 442, 642, ect.).
- K-Frame: Medium-sized service frames (Models 10, 15, 19, 66, ect.).
- L-Frame: Medium-Large frames with reinforced top straps (Models 586, 686, ect.).
- N-Frame: Large, heavy-duty frames (Models 27, 28, 29, 629, ect.).
Internal lockwork components—like mainsprings, triggers, and hammers—are size-dependent and generally only interchange within the same frame family.
What causes a Smith & Wesson revolver to have a "soft" carry-up or timing issue?
If your cylinder fails to lock completely into position before the hammer falls, your revolver has a timing issue. This is usually caused by a worn cylinder hand, a degraded cylinder stop spring, or wear on the cylinder ratchet teeth. The hand pushes against the ratchet to rotate the cylinder; over thousands of rounds, the hand wears down and grows too short. Replacing it with a factory-spec hand or an oversized hand fitted by a gunsmith restores crisp cylinder indexing.
What is Smith & Wesson revolver "endshake" and how do you fix it?
Cylinder endshake is excessive back-and-forth horizontal movement of the cylinder inside the frame window. It is caused by wear to the cylinder crane arbor or the interior face of the cylinder. If left uncorrected, it leads to headspace issues or light primer strikes. Endshake is typically fixed by installing precision stainless steel crane shims inside the cylinder assembly or replacing a severely worn crane completely to restore proper barrel-to-cylinder gap.
Are older S&W revolver parts compatible with newer "dash" models?
Not always. Smith & Wesson indicates engineering design updates using a "dash number" stamped next to the model number inside the crane (e.g., Model 29-2 vs Model 29-3). Major historical revisions changed parts compatibility completely. Key shifts include the elimination of pinned barrels and recessed cylinders (P&R) in 1982, the transition from hammer-mounted firing pins to frame-mounted firing pins, and the introduction of the internal frame lock system. Always cross-reference your specific dash number before ordering internal action parts.
Why am I getting light primer strikes on my S&W revolver?
Light strikes on a double-action Smith & Wesson are usually caused by a backed-out strain screw, a fatigued mainspring, or a damaged firing pin. The strain screw located on the front strap of the grip frame controls leaf mainspring tension. If this screw backs out even half a turn, hammer velocity drops. If tightening the strain screw completely does not fix misfires, replace the old mainspring with a factory-weight replacement spring or check for a chipped frame-mounted firing pin.