Smith & Wesson Pre-10 Military & Police K Frame .38 Special Thumbpiece New Old Stock - K303

Smith & Wesson Pre-10 Military & Police K Frame .38 Special Thumbpiece — New Old Stock

Part # K303 | New Old Stock (NOS) | Pre-Model Number Era

Factory Smith & Wesson new old stock thumbpiece (cylinder release latch) for the K Frame Pre-10 Military & Police Hand Ejector revolver chambered in .38 Special. The thumbpiece is the lever pushed forward to swing the cylinder out for loading and unloading. The Pre-10 is the pre-model-number designation for the iconic K Frame Military & Police (M&P) produced before S&W adopted model numbers in 1957–58. New old stock — unused factory part. Gunsmith installation recommended.

Compatibility:

• Frame: K Frame
• Model: Pre-10 (Military & Police Hand Ejector / pre-model-number era)
• Caliber: .38 Special

Specifications:

• Component: Thumbpiece (cylinder release latch)
• Era: Pre-1957 (pre-model-number)
• Condition: New Old Stock (NOS) — unused
• OEM: Factory Smith & Wesson part

Note: Disassembly and installation by a qualified gunsmith is recommended. Some parts may require fitting. Pre-model-number parts may vary slightly — verify fit before installation.

How to find your model number: Swing out the cylinder and check behind the yoke on the frame. Model numbers began in 1957–58. If no model number is present, your revolver may be a pre-model-number variant — contact us with your serial number for assistance.