The Smith & Wesson M&P FPC is a pistol caliber carbine chambered in 5.7x28mm with a 16.25-inch threaded barrel. It has a 22+1 capacity, an optics-ready receiver, and a black finish throughout. The carbine ships with three 22-round magazines and includes stock mag storage. 
 

Key Specifications 

• Brand: Smith & Wesson 
• Model: M&P FPC 
• Caliber: 5.7x28mm 
• Action: Semi Auto 
• Capacity: 22+1 
• Barrel Length: 16.25 inches 
• Color/Finish: Black 
   

Detailed Features 

• 16.25-inch threaded barrel 
• Optics-ready receiver 
• Ships with three 22-round magazines 
• Stock magazine storage built in 
• Pistol caliber carbine platform

Owners of the M&P FPC in 5.7x28mm are generally enthusiastic about the caliber choice. The 5.7x28mm cartridge out of a 16.25-inch barrel produces noticeably more velocity than pistol-length barrels, and that comes up often as a reason buyers chose this over a 9mm carbine.

The three included 22-round magazines and the built-in stock storage are practical touches that owners appreciate. The threaded barrel is popular for adding a suppressor or compensator without additional gunsmithing. Optics mounting is straightforward and widely praised.

The most common criticism is ammunition cost and availability for 5.7x28mm compared to 9mm carbine alternatives. A small number of owners mention the trigger is heavier than they expected for a modern semi-auto carbine. Overall build quality and reliability are rated well by most, with few reports of malfunctions after basic break-in.