Smith & Wesson M&P15 300 Whisper
Smith & Wesson, Inc. · Rifle · Discontinued · 2011
Also known as: M&P15 .300 Whisper, M&P-15 300 Whisper
Overview
The Smith & Wesson M&P15 300 Whisper is a gas-operated, semi-automatic AR-15 pattern rifle chambered in .300 AAC Blackout (also marked .300 Whisper). Built on the company's M&P15 platform, it pairs a 16-inch Melonite-finished barrel with a 1-in-7.5-inch 5R twist that stabilizes bullets from 110 to 220+ grains, allowing both supersonic and subsonic loads. A 5/8-24 threaded muzzle with an A2-style flash hider makes it suppressor-ready, and it ships on a six-position collapsible CAR stock.
Specifications
| Weight (empty) | 2894 g (102.1 oz) |
| Overall Length | 889 mm (35.00") |
| Folded Length | 813 mm (32.01") |
| Barrel Length | 406 mm (15.98") |
| Action Type | Gas Operated |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Action |
| Magazine Capacity | 10 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 660 m/s (2165 fps) |
| Muzzle Energy | 1550 J (1143 ft·lbf) |
| Effective Range | 400 m (437 yd) |
| Maximum Range | 1500 m (1640 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 190 mm (7.48") |
| Number of Grooves | 5 |
| Frame Material | Aluminum |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Melonite |
Calibers
- .300 AAC Blackout · primary — also known as .300 BLK, 7.62x35mm, .300 Whisper
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety
- Features: Threaded Barrel, Flash Hider, Collapsible Stock, Accessory Rail, 5r Rifling, Suppressor Ready
Base model
Production
Production years: 2011-2010s
Commercial and law-enforcement AR-15 variant; exact production figures not published
Origin
Country of origin: United States
Designer: Smith & Wesson
Notes
Marketed under the dual .300 Whisper/.300 AAC Blackout designation. Offered in black anodized and Realtree APG camouflage finishes. Later superseded in the S&W catalog by the M&P15 300 in .300 Blackout.
Background
The .300 Whisper/.300 Blackout chambering lets an AR-15 fire heavy subsonic bullets that stay quiet under a suppressor while feeding from standard 5.56 magazines, and the M&P15 300 Whisper was one of the first mainstream factory rifles to embrace that role.