Hi William, Yes it comes with 3 magazines:
One 7-round magazine.
Two 8-round extended grip magazines. -----Features
• Incorporates the design features of the M&P M2.0 line of firearms.
• Aggressive grip texture for enhanced control.
• New M&P M2.0 crisp trigger with lighter trigger pull.
• Tactile and audible trigger reset.
• Extremely thin and lightweight - can be comfortably carried all day.
• M&P’s patented take-down lever and sear deactivation systems allow for disassembly without pulling the trigger.
• Includes 3 magazines:
One 7-round magazine.
Two 8-round extended grip magazines.
• Optimal 18-degree grip angle for natural point of aim.
• Armornite® durable corrosion resistant finish.
• Backed by Smith & Wesson’s Lifetime Service Policy.

This pistol comes from the factory with • 3 magazines: - One 7-round magazine & Two 8-round extended grip magazines.

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Sure does. It comes with 3 magazines: One 7-round magazine. Two 8-round extended grip magazines. -----Features Incorporates the design features of the M&P M2.0 line of firearms. Aggressive grip texture for enhanced control. New M&P M2.0 crisp trigger with lighter trigger pull. Tactile and audible trigger reset. Extremely thin and lightweight - can be comfortably carried all day. M&P’s patented take-down lever and sear deactivation systems allow for disassembly without pulling the trigger. Includes 3 magazines: One 7-round magazine. Two 8-round extended grip magazines. Optimal 18-degree grip angle for natural point of aim. Armornite® durable corrosion resistant finish