Diamondback DB15 Diamond Series 5.56 NATO AR-15 Rifle – Mission First Tactical Stock, M-LOK Rail, Flip-Up Sights
This Diamondback DB15 Diamond Series rifle pairs the company’s forged 7075-T6 aluminum receivers with a 16-inch 4150 CrMoV barrel and a free-float 15-inch M-LOK S-Rail. Outfitted with a Mission First Tactical Battlelink adjustable stock and low-profile flip-up sights, it offers a feature-rich, ready-to-run platform built entirely in Cocoa, Florida.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling – Intact, well-defined lands and grooves.
Specific Condition Notes: Light finish wear is visible on high-contact points, but all controls operate smoothly and the custom furniture remains tight and secure.
What’s Included
- Low-profile flip-up front sight (installed)
- Low-profile flip-up rear sight (installed)
- Magpul PMAG Gen M2 30-round magazine
Built on the proven AR-15 platform, the DB15 employs a mid-length direct-impingement gas system for balanced recoil and reliable cycling. The factory Diamondback two-port muzzle brake further tempers muzzle rise, keeping follow-up shots quick and controllable.
The 15-inch free-float S-Rail features full-length 1913 Picatinny up top and M-LOK slots at the three, six, and nine o’clock positions, giving plenty of real estate for lights, bipods, and other accessories. Anti-rotation tabs and integrated QD sockets add strength and sling flexibility.
Custom appointments set this rifle apart from a standard DB15. The Mission First Tactical Battlelink stock offers six-position adjustability, a molded recoil pad, and an ambidextrous QD cup. Both upgrades lighten the rifle and enhance ergonomics without sacrificing durability.
The 16-inch medium-profile barrel wears a black-nitride finish for corrosion resistance and accepts common muzzle devices or suppressors via its 1/2-28 TPI threads. Chambered in 5.56 NATO, it safely runs .223 Remington ammunition for versatility at the range or in the field.