Diamondback DB15 5.56 NATO AR-15 Rifle – 16" Nitride Barrel, Free-Float 15" M-LOK Rail, Collapsible Stock
Built in the USA, the Diamondback DB15 pairs forged 7075-T6 aluminum receivers with a 16-inch 4150 Cr-MoV nitride-finished barrel to deliver a lightweight, feature-rich AR-15 platform. A 15-inch free-float M-LOK rail, shot-peened MPI bolt-carrier group, and Magpul furniture give this rifle practical upgrades straight from the factory, making it ready for range work or duty use right out of the box.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
This DB15 shows minimal markings from previous handling or use; the bore remains bright and clean.
What’s Included
- Diamondback factory cardboard box
- Diamondback DB15 owner’s manual
- Magpul PMAG Gen M2 AR/M4 30-round polymer magazine
Forged upper and lower receivers feature a T-marked Picatinny top rail for consistent optic placement, while the lower is marked “CAL MULTI” for caliber flexibility.
The 16-inch barrel is threaded 1/2-28 for muzzle devices or suppressors and uses a 1:8 RH twist to stabilize a wide range of 5.56 NATO bullet weights. Its black nitride treatment enhances corrosion resistance and barrel life.
A shot-peened, magnetic-particle-inspected bolt-carrier group and direct-impingement system provide proven reliability. The mid-length charging handle and standard manual safety keep controls familiar to AR users.
The 15-inch free-float aluminum M-LOK handguard includes anti-rotation tabs and plenty of rail space for accessories. A six-position collapsible Magpul MOE stock and matching polymer grip deliver ergonomic handling while keeping unloaded weight to about 6.6 lb.
Additional touches—such as the custom “5.56 NATO” dust-cover door and factory MSRP of $517—round out a current-production rifle that blends affordability with useful enhancements.