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40 S&W platforms
double-action-only profile that defines the Centennial design
Writing Paper*
Contact us with your serial number and we'll help identify the correct parts
Basic gunsmithing skills recommended for proper installation and function testing
S&W M&P 9/40 Sear Housing Block Manual Safety | OEM 423870000 Sheriff 40 S&W platformsSmith & Wesson OEM Sear Housing Block Assembly for M&P 9 40 Pistols with Manual Safety Lever This factory sear housing block assembly with integrated manual safety lever is a critical fire control component for M&P9 and M&P40 pistols equipped with manual thumb safety. Genuine S&W quality ensures proper fit, reliable function, and safe operation. Genuine S&W Part: Factory OEM component (Part #423870000) Multi Caliber Fit: Compatible with M&P 9mm and .
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