Smith & Wesson OEM factory replacement magazine safety spring for the M&P Shield series, compatible with M&P Shield 9, M&P Shield .40, and M&P Shield .45 models.
Part# 421670000
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Features: Smith & Wesson factory part
Gunsmiths Required: Disassembly and Assembly required to replace part.
Some parts may require installation and fitting by a qualified gun smith Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts.