Smith & Wesson K Frame Bolt Spring & Plunger - Models 17 & 18 - Old Style - Used - .22 LR 1745B

Factory OEM Smith & Wesson K Frame Bolt Spring & Plunger

Part Number: 1745B
Compatibility: K Frame Models 17 & 18
Caliber: .22 LR (Rimfire)
Style: Old Style
Condition: Used
Frame Size: K Frame
Includes: Bolt spring and plunger

This is an authentic Smith & Wesson factory bolt spring and plunger assembly for K Frame Models 17 and 18 revolvers. The bolt spring provides tension to the bolt (cylinder stop), ensuring proper engagement with the cylinder notches for reliable lockup and timing.

Features:

• Genuine Smith & Wesson factory part
• Complete assembly with spring and plunger
• Old-style configuration for early production models
• Used condition with functional operation
• Direct replacement for worn or damaged springs
• Essential for proper bolt tension and cylinder lockup

Compatibility Note: The bolt spring and plunger are interchangeable across all K Frame models, both rimfire and centerfire. This part will fit Models 10, 12, 13, 14, 15, 16, 17, 18, 19, 48, 64, 65, 66, 67, 617, and 648. The "old style" designation refers to earlier production variants.

Function: The bolt spring provides upward tension on the bolt (cylinder stop), ensuring it properly engages the cylinder notches for reliable lockup. A weak or damaged spring can cause timing issues and cylinder misalignment.

Installation: Professional gunsmith installation recommended. The bolt spring and plunger require internal disassembly and proper adjustment to ensure correct bolt tension and timing.

How to Identify Your Smith & Wesson Model: Swing out the cylinder and check behind the yoke on the frame for the model number. Model numbers began in 1957-58. If you need assistance identifying your revolver or confirming compatibility, contact us with your serial number.

Questions? Contact us at sales@usagunsandgear.com or call 770-544-8075. We specialize in Smith & Wesson pistol and revolver parts - new, used, NOS, and refurbished.