The Smith & Wesson M&P15 Sport III is an AR-pattern semi-automatic rifle chambered in .223 Rem/5.56 NATO with a 16-inch barrel and 10-round capacity. It comes with a Crimson Trace red dot sight and an M-Lok handguard. The rifle has a fixed stock and a black Armornite finish. 
 

Key Specifications 

• Brand: Smith & Wesson 
• Model: M&P15 Sport III 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 10 
• Barrel Length: 16 inches 
• Color/Finish: Black 
   

Detailed Features 

• 16-inch barrel with black Armornite finish 
• Crimson Trace red dot sight included 
• M-Lok handguard 
• Fixed stock 
• 10-round magazine

Owners of the M&P15 Sport III point to the included Crimson Trace red dot as the main draw over earlier Sport variants; getting an optic bundled at the asking price is considered good value by most buyers. The M-Lok handguard is a consistent upgrade appreciated over the older Sport II configuration.

The fixed stock is a practical compliance feature for restricted-capacity markets, and buyers in those states specifically seek out this configuration. Shooters in standard-capacity states sometimes swap the magazine right away.

The Armornite finish holds up well to regular range use according to most long-term owners. A common criticism is that the trigger is functional but unremarkable, and many Sport III owners swap it after a few hundred rounds.