Diamondback DB15 Obsidian 5.56 NATO 16-inch M-LOK AR Rifle

About this product

The Diamondback DB15 Obsidian is a 5.56 NATO semi-automatic AR-style rifle built on forged 7075-T6 aluminum receivers. It features a 16-inch 4150 Chrome-Moly-Vanadium (CrMoV) black nitride barrel with a 1:8 right-hand twist and a mid-length gas system. The rifle ships with a 15-inch M-LOK anti-rotation handguard, Magpul CTR stock, Magpul MOE-K2 grip, ambidextrous controls, and one Magpul Gen M3 30-round magazine. Weight is listed at 6.60 pounds and the muzzle is finished with the DB Obsidian Muzzle Brake (1/2×28).

Key Specifications

• Chambered in 5.56 NATO.
• The barrel measures 16 inches and is 4150 CrMoV with a black nitride finish and a 1:8 right-hand twist.
• Configured with a mid-length gas system for balanced cycling and recoil impulse.
• Uses a shot-peened, magnetic-particle inspected Mil-Spec 8620 bolt carrier group.
• Built on forged 7075-T6 aluminum upper and lower receivers.
• Features a 15-inch M-LOK anti-rotation V4 S handguard with full Picatinny sections and QD mounts.
• Includes a Magpul CTR stock and a Magpul MOE-K2 grip.
• Ships with a 30+1 capacity using one Magpul Gen M3 30-round magazine.
• The muzzle device is the DB Obsidian Muzzle Brake (1/2×28).
• The rifle’s weight is listed at 6.60 lbs.

Designed as a ready-to-configure modern sporting rifle, the DB15 Obsidian pairs durable construction with practical, range-ready features. Its mid-length gas system, robust barrel treatment, and ergonomic Magpul furniture make it a reliable platform for training, target work, and general-purpose utility. With ambidextrous controls and an included 30‑round PMAG, this model serves experienced shooters seeking a straightforward, capable AR platform.

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