Smith & Wesson M&P15 Sport Gen 1 5.56 NATO AR-15, 16 inch Melonite Barrel, 1:8 Twist, 1/2x28, Slick-Side Upper
This first-generation S&W M&P15 Sport stands out with its slick-side, T-marked flat-top upper that omits the forward assist and ejection-port dust cover. It features a 16 inch melonite-treated 4140 steel barrel stamped "5.56 NATO 1/8," forged 7075-T6 aluminum receivers, and classic A2 front sight base with bayonet lug. The rifle is in excellent condition with a clean, mirror-bright bore.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal signs of prior use. The exterior shows very minor blemishes. The bore is clean and shiny.
What’s Included
- Polymer flip-up rear aperture sight installed on upper rail
- 1x 30-round USGI-pattern aluminum AR-15 magazine
This Sport Gen 1 configuration is defined by its slick-side upper receiver without a forward assist or dust cover, paired with a T-marked flat-top Picatinny rail for mounting the included flip-up rear sight. Both upper and lower receivers are forged 7075-T6 aluminum with a hard-coat anodized finish.
The 16 inch 4140 steel barrel is melonite-treated for durability and features a 1:8 twist. It is threaded 1/2x28 and fitted with an A2-pattern flash suppressor. The barrel is roll-marked "5.56 NATO 1/8" to match its chamber and twist specification.
Iron sights include a fixed A2 front sight base with bayonet lug and sling swivel, matched to a polymer flip-up rear aperture sight on the flat-top upper. Carbine-length two-piece polymer handguards with heat-shield holes provide classic AR ergonomics.
The rifle uses a semi-automatic, direct-impingement operating system with a standard magazine release and manual safety. Furniture includes an S&W-logoed six-position collapsible stock and an A2-style polymer pistol grip. Capacity is 30+1 with the included magazine. Made in the United States.

