The Diamondback DB15 Obsidian 5.56 NATO pistol is a versatile short-barreled platform built for shooters who want a compact, maneuverable AR without the NFA paperwork. This 11.5-inch barreled semi-auto delivers rifle-class ergonomics and modularity in a footprint that excels in tight quarters—whether you're running drills at the range, setting up a truck gun, or building a home-defense upper. The DB15 Obsidian combines proven direct impingement reliability with Diamondback's attention to component quality and finish, all anchored by the SB Tactical SBA5 brace for stable shooting control.
The 11-inch M-LOK handguard gives you full accessory mounting real estate without excessive weight or length, while the forged 7075 T-6 upper and lower receivers guarantee durability under repeated shooting. The barrel—Diamondback's own 4150 CrMoV steel with black nitride finish and a 1:8 twist—is built for velocity and thermal stability. A mil-spec bolt carrier group with shot-peened construction and magnetic particle inspection means you're running a component spec'd for military service. The included 30-round Magpul Gen M3 PMAG, Magpul MOE K2 grip, and Obsidian muzzle brake round out a rifle ready to shoot out of the box; the DB-spec brake features a 1/2x28 thread pattern for compatibility with common suppressors and flash hiders.
This is a rifle for the shooter who values modularity and real-world utility. The A3 flattop receiver, standard mil-spec trigger, and flat-top Picatinny rail make it a natural host for your favorite red dot, magnified optic, or night-vision setup. At just over 6 pounds and collapsing to 28.25 inches, the DB15 Obsidian works in vehicles, tight spaces, and unpredictable situations where a full-size rifle feels clumsy. Whether you're upgrading to a short-barreled setup or consolidating your rifle inventory, this is a serious piece built by people who understand what works.
| Caliber | 5.56 NATO |
| Barrel Length | 11.5 inches |
| Barrel Material | 4150 CrMoV with black nitride finish |
| Barrel Twist | 1:8 right-hand |
| Upper Receiver | Forged 7075 T-6 aluminum, A3 flattop with T-marks |
| Lower Receiver | Forged 7075 T-6 aluminum |
| Handguard | 11-inch M-LOK with full Picatinny rail and QD mounts |
| Gas System | Direct impingement, carbine-length |
| Bolt Carrier Group | Mil-spec 8620, shot-peened, magnetic particle inspected |
| Trigger | Standard mil-spec |
| Grip | Magpul MOE K2 |
| Brace | SB Tactical SBA5 |
| Muzzle Device | DB Obsidian muzzle brake, 1/2x28 |
| Magazine | Magpul Gen M3 PMAG, 30+1 capacity |
| Weight | 6.25 pounds |
| Length (Collapsed) | 28.25 inches |
| Length (Extended) | 31 inches |
| Sights | None (flat-top ready for optics) |
No. The DB15 Obsidian ships as a pistol with an SB Tactical SBA5 stabilizing brace, not a stock. It does not require NFA registration in its pistol configuration. Always check your local and state laws regarding pistol braces and short-barreled firearms, as regulations vary.
The 11-inch M-LOK handguard features full Picatinny rail sections and integrated QD mount points. You can mount any standard Picatinny rail optic (red dots, magnified scopes, night vision) directly to the flat-top receiver, and use the handguard rails for lights, lasers, vertical grips, and other M-LOK accessories.
The DB Obsidian muzzle brake uses a standard 1/2x28 thread pattern, which is compatible with most commercial suppressors and sound moderators in 5.56 NATO. Always verify suppressor compatibility and check local regulations on silencers in your area.
The DB15 Obsidian comes with one Magpul Gen M3 PMAG 30-round magazine and the SBA5 brace. Sights are not included; the rifle ships with a flat-top Picatinny rail ready for your choice of optic.
Diamondback
Diamondback
Diamondback
