S&W M&P 15 Sport III 5.56 NATO 16in 30rd

The Smith & Wesson M&P 15 Sport III AR-Style Rifle is a semi-automatic modern sporting rifle chambered in 5.56 NATO, built around a lightweight and configurable AR platform. Featuring a 16-inch threaded barrel, free-floating M-LOK handguard, and full-length Picatinny top rail, it is designed to support optics and accessories while maintaining familiar AR-pattern controls.

Produced by Smith & Wesson, the M&P 15 Sport III is intended for shooters who want a reliable, entry-to-mid-level AR-15 for range use, recreational shooting, and customization. Its mid-length gas system and free-floating handguard help balance recoil control and handling, while the forged aluminum receivers provide durability without excessive weight. The rifle supports both 5.56 NATO and .223 Remington ammunition, giving users flexibility in commonly available cartridges.

Key Features

• Chambered in 5.56 NATO / .223 Remington

• 16-inch 4140 steel barrel with Armornite finish for corrosion resistance

• 1:8″ twist rate with 5R rifling to support a wide range of bullet weights

• Mid-length gas system for smoother cycling

• Free-floating 15″ M-LOK handguard for accessory mounting

• Full-length Picatinny-style top rail for optics and iron sights

• A2-style flash suppressor with 1/2×28 threaded muzzle

• Standard AR-15 controls with forward assist and dust cover

• Includes one detachable 30-round magazine

Specifications & Build

The M&P 15 Sport III uses forged 7075-T6 aluminum for both the upper and lower receivers, paired with a 4140 steel barrel treated with an Armornite finish. Overall unloaded weight is approximately 6.52 pounds (2,957 g). The rifle measures roughly 32 inches with the stock collapsed and 35 inches extended, with an overall height of about 8 inches and width of approximately 2.5 inches. It features a six-position collapsible stock, polymer pistol grip, integral trigger guard, and a chromed firing pin.

• Barrel length: 16 in

• Weight: ~6.52 lbs

• Overall length: 32″ collapsed / 35″ extended

• Receivers: Forged 7075-T6 aluminum

• Muzzle thread: 1/2×28

Compatibility & Intended Use

As a standard AR-platform rifle, the M&P 15 Sport III accepts common AR-15 magazines and accessories. Optics mount directly to the Picatinny rail, while lights, grips, and other equipment can be attached via the M-LOK handguard. Typical configurations include a primary optic with optional backup iron sights, a sling, and handguard-mounted accessories. The rifle is suited for range practice, recreational shooting, and lawful sporting use where modularity and familiarity are priorities.

What’s Included

• Smith & Wesson M&P 15 Sport III rifle

• One 30-round detachable magazine

This AR-style rifle offers a balanced combination of lightweight construction, modern mounting options, and standard AR compatibility for shooters seeking a practical and adaptable 5.56 NATO platform.