Smith & Wesson Model 43 Airweight J Frame Bolt, Spring & Plunger Blue Steel .22 LR, Part# 45-43-C
$12.99
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Smith & Wesson Model 43 Airweight J Frame Bolt, Spring & Plunger Blue Steel .22 LR, Part# 45-43-C
$12.99
Smith & Wesson Model 43 Airweight Bolt, Spring & Plunger – Part# 45-43-C
This is a genuine factory Smith & Wesson bolt, spring, and plunger set for the J Frame Model 43 (.22/.32 Kit Gun Airweight) revolver chambered in .22 Long Rifle. A used blue steel set in serviceable condition — a cost-effective solution for restoring proper cylinder lockup on your Model 43 Airweight.
In S&W revolver terminology, the bolt (also called the cylinder stop) rises to lock the cylinder in precise alignment with the barrel at the moment of firing. The plunger 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: 45-43-C
- Part Name: Bolt, Spring & Plunger (Cylinder Stop Assembly)
- Finish: Blue Steel
- Condition: Used, factory original
- Frame: J Frame (Airweight — alloy frame)
- Caliber: .22 Long Rifle (rimfire)
- Includes: Bolt (cylinder stop) + spring + plunger
- Function: Locks cylinder in barrel alignment at moment of firing
Model Compatibility
| Model | Caliber | Frame | Compatible |
|---|---|---|---|
| Model 43 Airweight (.22/.32 Kit Gun) | .22 LR (rimfire) | J Frame Alloy | ✅ Yes |
| Model 43C | .22 LR (rimfire) | J Frame Alloy | ⚠️ Verify fitment |
| Model 317 (Kit Gun) | .22 LR (rimfire) | J Frame Alloy | ⚠️ Verify fitment |
| Model 34 (.22/.32 Kit Gun) | .22 LR (rimfire) | J Frame Steel | ⚠️ Verify fitment — different frame material |
| Model 63 | .22 LR (rimfire) | J Frame Stainless | ⚠️ Verify fitment — different finish & frame material |
| Model 36 / 37 / 38 | .38 Special | J Frame | ⚠️ Verify fitment — centerfire |
| K / L / N Frame | Various | Larger frames | ❌ Different frame size |
Note: The Model 43 Airweight uses an alloy (aluminum) frame — parts may not interchange with steel or stainless J Frame revolvers. This bolt set is blue steel finish. Bolt assemblies are frame-specific and not interchangeable between J, K, L, or N Frame 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.