Smith & Wesson Model 63 J Frame Bolt, Spring & Plunger .22 LR Stainless, Part# 6345

Smith & Wesson Model 63 Bolt, Spring & Plunger – Part# 6345

This is a genuine factory Smith & Wesson bolt, spring, and plunger set for the J Frame Model 63 revolver chambered in .22 Long Rifle. An old-style used stainless steel part in serviceable condition — a cost-effective solution for restoring proper cylinder lockup on your Model 63.

In S&W revolver terminology, the bolt (also called the cylinder stop) is the component that rises to lock the cylinder in precise alignment with the barrel at the moment of firing. The plunger is the pin that drives the bolt upward into the cylinder notch, and the spring provides the tension to keep it engaged. A worn, chipped, or broken bolt, fatigued spring, or damaged plunger results in cylinder wobble, poor lockup, and degraded accuracy or reliability.

Part Details

• Part Number: 6345
• Part Name: Bolt, Spring & Plunger (Cylinder Stop Assembly)
• Material: Stainless Steel
• Condition: Used, factory original (old style)
• Frame: J Frame
• Caliber: .22 Long Rifle (rimfire)
• Includes: Bolt (cylinder stop) + spring + plunger
• Function: Locks cylinder in barrel alignment at moment of firing

Model Compatibility

Note: Bolt assemblies are frame-specific and not interchangeable between J, K, L, or N Frame revolvers. Parts may also vary between rimfire and centerfire J Frame configurations and between old-style and current-production revolvers. Always confirm your exact model before ordering. Model numbers are stamped on the frame behind the yoke when the cylinder is swung out. Pre-1957 revolvers may not have a model number — contact us with your serial number for assistance.

Installation

Bolt, spring, and plunger replacement requires side plate removal and disassembly of the lock work. Cylinder timing must be verified after installation to ensure safe, reliable lockup. We recommend installation by a qualified gunsmith.

Questions about fitment? Call or email us — we're happy to help.