This replacement or spare magazine is compatible with your S&W M&P Shield. It is constructed of heat treated steel with injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA.
Specifications:

Caliber	9mm Luger
Capacity	8
Finish	Blued
Model	S&W Shield
Material	Steel
Type	Detachable
Model Fit	M&P Shield
Brand Fit	Smith & Wesson
Max Capacity	8