The Diamondback DB15 Obsidian 5.56 NATO is a 16-inch AR-15 rifle with a DB Obsidian muzzle brake and ambidextrous controls (brand part no. DB1784K001). Diamondback Firearms pairs a mid-length gas system and pinned gas block with a Breek Arms Warhammer charging handle and Battle Arms safety, bolt catch and magazine catch. A 15-inch M-LOK V4 S-Rail with full Picatinny and QD mounts surrounds the barrel. It is a well-equipped rifle for shooters who value ergonomics and fast follow-up shots.

Key Specifications

• Caliber is 5.56 NATO, the standard round for AR-15 platform rifles.
• The barrel is 16 inches of medium-profile 4150 CrMoV steel with black nitride.
• Rate of twist is 1:8 right-hand, a good match for heavier 5.56 bullets.
• The muzzle device is a DB Obsidian muzzle brake on 1/2×28 threads, which tames recoil and muzzle rise.
• The gas system is mid-length with a pinned gas block, a setup that smooths recoil.
• The safety is a Battle Arms ambidextrous selector, so it can be operated from either side.
• The charging handle is a Breek Arms Warhammer MOD 2 ambidextrous model, and the bolt catch and magazine catch are Battle Arms enhanced ambidextrous parts.
• The handguard is a 15-inch M-LOK V4 S-Rail with full Picatinny and QD mounts, anti-rotation for accessories.
• The stock is a Magpul CTR, the grip is a Magpul MOE K2 and the lower has a Magpul MOE enhanced trigger guard.
• The included magazine is a Magpul Gen M3 PMAG, 30 rounds, and weight is 6.6 pounds.

Frequently Asked Questions

Does the Obsidian have a muzzle brake? Yes. It carries a DB Obsidian muzzle brake on standard 1/2×28 threads.

Are the controls ambidextrous? Yes. The safety selector, charging handle, bolt catch and magazine catch are all ambidextrous.

What stock and grip does it have? It has a Magpul CTR stock and a Magpul MOE K2 grip.

Buy the Diamondback DB15 Obsidian Series 5.56 NATO Rifle, 16-Inch Barrel, Muzzle Brake, 15-Inch M-LOK, Ambidextrous Safety, Black, 30-Round

The Obsidian Series is where Diamondback puts its best AR-15 parts, and this black 16-inch version carries them all. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse our other AR rifles.