The Diamondback DB1984K001 Obsidian is a 5.56 NATO pistol built on a forged aluminum platform with a compact 11.5-inch barrel—ideal for shooters who want AR-platform ergonomics and modularity in a shorter, more maneuverable package. Whether you're setting up a truck gun, a home-defense carbine, or a backyard plinker, this rifle-length gas system delivers reliable direct-impingement operation without requiring a traditional stock. The included SB Tactical SBA5 brace gives you a stabilizing platform while keeping the overall footprint under 32 inches when fully extended.
The upper receiver is a forged 7075 T-6 aluminum A3 flattop with T-marking, paired to a similarly robust lower receiver. Diamondback's own 11.5-inch barrel is hammer-forged 4150 CrMoV steel with black nitride finish and a 1:8 twist rate suited to a wide range of 5.56 loads. The gas system runs carbine-length for reliable cycling, and the bolt carrier is mil-spec 8620 steel with shot-peening and magnetic-particle inspection—the kind of attention to detail that keeps it running when it matters. Feeding is handled by a Magpul Gen M3 PMAG (30-round) magazine.
Ergonomics and modularity are where this gun shines. The 11-inch M-LOK handguard gives you tons of rail real estate for lights, lasers, or slings without adding unnecessary weight. A Magpul MOE K2 grip keeps your hand positioned naturally, and the included SB Tactical brace locks up solid. The DB Obsidian muzzle brake (1/2 x 28 thread) is already installed, ready to go. No sights are included, so you can pick optics that match your mission—red dot, LPVO, or traditional iron sights.
This is a no-nonsense, sub-7-pound platform that doesn't compromise on parts quality or shootability. If you need a compact, AR-15-compatible 5.56 pistol with real features and real durability, the Obsidian does the job.
| Caliber | 5.56 NATO |
| Barrel Length | 11.5 inches |
| Barrel Material | 4150 CrMoV steel, black nitride finish |
| Barrel Twist | 1:8 RH |
| Upper Receiver | Forged 7075 T-6 aluminum, A3 flattop with T-mark |
| Lower Receiver | Forged 7075 T-6 aluminum with Magpul MOE Enhanced Trigger Guard |
| Gas System | Carbine-length direct impingement |
| Bolt Carrier Group | Mil-spec 8620 steel, shot-peened, magnetic-particle inspected |
| Handguard | 11 inches, M-LOK with full Picatinny rail and QD mounts |
| Grip | Magpul MOE K2 |
| Brace | SB Tactical SBA5 |
| Trigger | Standard mil-spec |
| Magazine | Magpul Gen M3 PMAG, 30-round capacity |
| Muzzle Device | DB Obsidian muzzle brake, 1/2 x 28 thread |
| Weight | 6.2 pounds |
| Length (Collapsed) | 28.25 inches |
| Length (Extended) | 31 inches |
| Finish | Black hardcoat anodize |
| Magazine Included | Yes, Magpul Gen M3 PMAG 30-round |
Yes. The Obsidian ships with a Magpul Gen M3 PMAG 30-round magazine and accepts any standard 5.56 NATO or .223 Remington AR-platform magazine.
No sights are included. The upper receiver is a flat-top design ready for you to mount the optic of your choice—whether that's a red dot, LPVO, or traditional iron sights mounted to the rail.
Yes. The DB Obsidian muzzle brake is pre-installed and ready to shoot. It is threaded 1/2 x 28, so you can swap it for a suppressor or other 1/2 x 28 device if needed in the future.
The SB Tactical SBA5 is a stabilizing brace that attaches to the lower receiver and provides a stable platform for your support arm during shooting. It is fully adjustable and collapses when not in use, keeping your overall profile compact.
Diamondback
Diamondback
Diamondback
