M&P15 Sport III
Smith & Wesson · Rifle · In Production · 2024
Also known as: M&P15 Sport 3, M&P Sport III, S&W Sport III
Overview
The M&P15 Sport III is a semi-automatic rifle chambered in 5.56x45mm NATO, introduced by Smith & Wesson in 2024 as the modernized successor to the popular M&P15 Sport II. Built on the AR-15 pattern with a forged 7075-T6 aluminum upper and lower receiver, it advances the budget-oriented Sport line by adding a 15-inch free-float M-LOK handguard and a mid-length gas system, two features absent from earlier Sport models that improve accuracy and soften the recoil impulse. The 16-inch 4140 steel barrel carries a 1:8 twist with a 5R rifling profile and an Armornite corrosion-resistant finish, stabilizing a wide range of bullet weights from lightweight varmint loads to heavier match projectiles. A six-position adjustable M4-style stock and an A2 flash hider round out the configuration, while the flat-top Picatinny receiver ships optics-ready without iron sights. Weighing roughly 2957g (6.5 lb) empty and feeding from 30-round detachable box magazines, the Sport III targets recreational shooters, home defenders, and three-gun competitors seeking a free-float AR-15 at an entry-level price point.
Specifications
| Weight (empty) | 2957 g (104.3 oz) |
| Weight (loaded) | 3397 g (119.8 oz) |
| Overall Length | 889 mm (35.00") |
| Folded Length | 806 mm (31.73") |
| Barrel Length | 406 mm (15.98") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 905 m/s (2969 fps) |
| Muzzle Energy | 1640 J (1210 ft·lbf) |
| Effective Range | 500 m (547 yd) |
| Maximum Range | 3600 m (3937 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 203 mm (7.99") |
| Number of Grooves | 5 |
| Frame Material | Aluminum Alloy |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Armornite |
Calibers
- 5.56x45mm NATO · primary · 5.56x45mm NATO — also known as 5.56mm NATO, 5.56x45mm, .223 Remington
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety Selector
- Features: Free Float Handguard, M Lok Handguard, Mid Length Gas System, Collapsible Stock, A2 Flash Hider, Forward Assist, Dust Cover, Flat Top Receiver, Picatinny Rail, Armornite Finish, 5r Rifling, Optics Ready
Base model
Service history
Operators
- Civilian Sport Shooters · adopted 2024
Production
Production years: 2024-present
Production figures not disclosed by Smith & Wesson.
Origin
Country of origin: United States
Designer: Eugene Stoner
Notes
The Sport III's headline upgrades over the Sport II are its free-floating M-LOK handguard and mid-length gas system, which together deliver a smoother cycling action and better accuracy potential than the earlier carbine-length, non-free-float design. It retains the forward assist and dust cover of the Sport II and ships without iron sights, reflecting the modern optics-ready market. Launched at an MSRP around 749 USD, it continues Smith & Wesson's strategy of offering feature-rich AR-15 rifles at mass-market prices.
Background
When Smith & Wesson refreshed its best-selling budget AR line in 2024, the Sport III finally brought the two features enthusiasts had long asked for on an entry-level rifle: a free-float handguard and a mid-length gas system. It signalled how far the baseline for an affordable AR-15 had shifted, delivering out of the box what once required aftermarket upgrades.