Diamondback DB15 Obsidian 5.56 NATO 16 in FDE

The Diamondback DB15 Obsidian 5.56 NATO 16 in FDE is a ready-to-run AR-platform rifle built for new shooters and families who want a reliable, lightweight rifle without the hassle of upgrades. It comes from the factory with forged 7075-T6 aluminum receivers, a 16-inch 4150 Chrome-Moly Vanadium barrel finished in black nitride and Flat Dark Earth Cerakote, and a 15-inch M-LOK anti-rotation V4 S-Rail handguard. Per Diamondback specs, this rifle weighs approximately 6.60 lbs unloaded and ships with one Magpul Gen M3 30-round PMAG. The DB15 Obsidian is chambered for .223 Rem/5.56 NATO and features a Magpul CTR carbine stock and MOE K2 grip in FDE, plus a Battlearms ambidextrous safety selector — making it easy for right- or left-handed shooters to handle safely.

Key Features

• 16-inch 4150 Chrome-Moly Vanadium barrel with black nitride finish – This barrel material and treatment give you consistent accuracy and long barrel life. Why it matters: You get a barrel that resists wear and corrosion, so your rifle stays reliable through many range trips and storage conditions.
• 15-inch M-LOK anti-rotation V4 S-Rail handguard – The handguard is slim, lightweight, and locks tight to the upper receiver. Why it matters: You can mount lights, grips, or slings exactly where you need them, and the anti-rotation design keeps your accessories from shifting under recoil.
• Magpul CTR carbine stock and MOE K2 grip in FDE – Both are proven, comfortable parts that fit a wide range of hand sizes. Why it matters: New shooters and family members with smaller hands can get a solid, natural hold, and the stock has a friction lock to reduce wobble.
• Battlearms ambidextrous safety selector – This lets you switch safety on or off with either thumb. Why it matters: If you shoot left-handed or teach a left-handed shooter, you don’t have to break your grip to reach the safety.

Who It’s For

The DB15 Obsidian is built for family shooting coaches, beginners, and anyone who wants a reliable AR-style rifle without spending hours researching parts. It works well for range practice, home defense classes, and introducing new shooters to the platform. The lightweight build and ergonomic controls reduce fatigue during long sessions, and the ambidextrous safety makes it a good choice for households with both right- and left-handed shooters.

Pros & Cons

• Pro: Ready out of the box with quality Magpul furniture and ambi safety — no need to upgrade immediately.
• Pro: Lightweight at ~6.60 lbs, easy to carry and handle for smaller or newer shooters.
• Con: The barrel is 16 inches, which is good for maneuverability but may give slightly lower muzzle velocity compared to an 18- or 20-inch barrel for long-range shooting.

Comparison

Frequently Asked Questions

Trust & Delivery

• ✓ Nationwide delivery to all 50 states
• ✓ Ships within 1-2 business days
• ✓ 30-day returns
• ✓ Secure checkout

Last updated: April 2026

Browse more AR rifles in our AR Rifles category, or check out Magpul Accessories and Ambidextrous Controls.

According to the National Shooting Sports Foundation, AR-style rifles account for over 40% of new rifle sales in the U.S., making them the most popular platform for sport and home defense.