Description
The Diamondback Obsidian DB15 pistol in 300 AAC Blackout combines a 10 inch barrel, an Obsidian muzzle brake, a 9 inch M-LOK rail and an SB Tactical SBA5 brace, all finished in Olive Drab Green Cerakote. It is a compact, upgraded AR pistol for defense and range work.
Diamondback Obsidian DB15 300 BLK ODG Overview
The Obsidian line is Diamondback’s step up from its Carbon models, with an anti-rotation M-LOK rail, a Magpul MOE K2+ grip and a factory brake. Model DB1984B101 uses forged 7075-T6 aluminum receivers and measures 24 to 29.5 inches overall depending on brace position. It weighs about 6.25 pounds and ships with one 30 round PMAG and no sights. Diamondback builds the DB15 family in Cocoa, Florida.
300 Blackout in a Short Package
300 Blackout gives you 30 caliber bullets from a short barrel with nearly full-power results, and it runs on standard AR-15 magazines and bolts. Supersonic loads are an effective home-defense and hog round at close range. Heavy subsonic loads are popular with suppressor owners, though not every short-gas pistol cycles them reliably, so test any quiet load before relying on it.
The Obsidian Muzzle Brake
The factory brake cuts muzzle rise and felt recoil, making fast follow-up shots easier. The honest downside is blast: brakes push noise and concussion sideways toward anyone beside you and are unpleasant indoors or on a covered firing line. The 5/8×24 threads let you swap it for a flash hider or a suppressor mount if you prefer.
SBA5 Brace and Ergonomics
The SBA5 is a lighter, minimalist brace with five length positions and a quick-release sling point. Combined with the K2+ grip, which has a steeper angle and a rubberized feel, the pistol is comfortable for shooters with shorter arms. The anti-rotation rail keeps a light or laser from shifting under recoil.
Suppressors and NFA Rules
A suppressor is the natural partner for a 300 Blackout pistol, but suppressors are NFA items that need an approved ATF Form 4 and tax stamp, and several states prohibit them. Remove the brake carefully, use the correct crush washer or shims, and confirm alignment before mounting any can. Expect a wait of several months for approval in many cases, and budget for the stamp, mount and cleaning gear on top of the suppressor itself.
Safety and Care
Never mix 300 Blackout and 5.56 ammunition: a 300 Blackout round can chamber in a 5.56 gun and destroy it. Mark your magazines clearly. The green Cerakote resists corrosion, but brakes foul quickly, so scrub the ports and clean the bolt carrier after each session.
State Laws and Ownership
Braced AR pistols, threaded barrels, muzzle brakes and 30 round magazines are restricted or banned in some states and cities. The ATF’s 2023 brace rule was vacated by federal courts, but rules can change. Confirm your own state and local laws before ordering.
Specifications
- Manufacturer: Diamondback Firearms
- Model: Obsidian DB15 Pistol (DB1984B101)
- Caliber: 300 AAC Blackout
- Action: semi-auto
- Barrel: 10 in., threaded 5/8×24
- Muzzle device: Obsidian muzzle brake
- Overall length: 24 to 29.5 in.
- Weight: 6.25 lbs.
- Capacity: 30+1, one PMAG included
- Receivers: forged 7075-T6 aluminum
- Handguard: 9 in. anti-rotation M-LOK
- Brace: SB Tactical SBA5
- Grip: Magpul MOE K2+
- Sights: none
- Finish: Olive Drab Green Cerakote
- UPC: 810035756717
Before You Buy
Federal law requires handgun buyers to be 21 or older to purchase from a licensed dealer, and this AR pistol transfers as a handgun through your local FFL with a background check. Budget for an optic, hearing protection and 300 Blackout ammunition, which costs more than 5.56.
Who It Is For
The Diamondback Obsidian DB15 300 BLK ODG is a great fit for shooters who want an upgraded, ready-to-run 300 Blackout AR pistol with a brake, and owners planning a suppressed build down the road.
Buy the Diamondback Obsidian DB15 300 BLK ODG at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Diamondback Obsidian DB15 300 BLK ODG online and ship it to your local FFL dealer, or browse our full selection of firearms for more pistols. For factory details, visit Diamondback Firearms.
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