Diamondback Firearms DB15USLB 5.56 NATO Semi-Auto Rifle, 16″ Barrel
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$722.00Original price was: $722.00.$628.00Current price is: $628.00.
🚚 Ships to your local FFL — order online, put your FFL dealer’s name and address in the Order notes box at checkout, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
FREE SUPPRESSOR WITH THIS GUNBuy this firearm and get a free Outlier Backdraft Hunter 4″ suppressor, a $189 value. In stock now, while supplies last. How it works →
Diamondback Firearms DB15USLB is a semi-auto AR-style rifle chambered in 5.56 NATO with a 16" chrome moly barrel. It suits shooters who want a carbine-length-gas, optic-ready platform they can set up with their own sights, sling and accessories.
5.56 NATO semi-auto with 30+1 round capacity
16" 4150 chrome moly barrel, 1:8" twist
Direct impingement with a carbine gas system
6-position ATI Mil-Spec A2-style stock
Black anodized hard coat finish, A2 flash hider
SKU: DAV-DB1717K004 · Mfr part #: DB1717K004 · UPC: 810035754560
The Diamondback Firearms DB15USLB is a semi-auto rifle chambered in 5.56 NATO with a 16″ 4150 chrome moly barrel. It runs a direct impingement operating system with a carbine gas system, and it holds 30+1 rounds when loaded with a polymer AR-style magazine.
A few details set this rifle apart. The barrel is threaded and wears an A2 flash hider, so you have a starting point if you plan to change muzzle devices later. The twist rate is 1:8″, and the trigger is Mil-Spec. The rifle has a manual safety and no forward assist. The Black Anodized Hard Coat finish covers the metal, and the stock is a 6-position ATI Mil-Spec unit with A2-style grips. Overall length is 21.75″.
Who it suits
This rifle has no sights, so it fits a buyer who already knows how they want to set it up. If you like to pick your own optic or iron sights, this gives you a clean starting point. It also makes sense for a first AR build-out where you add parts over time.
Good pairings include a red dot or low-power optic, a set of flip-up backup sights, extra polymer AR-style magazines, a two-point or single-point sling, and a basic cleaning kit. A padded rifle case and a good set of ear and eye protection round out a range-ready kit.
Diamondback Firearms DB15USLB 5.56 NATO Semi-Auto Rifle, 16" Barrel Specifications
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What caliber is the Diamondback DB15USLB?
A: 5.56 NATO. It is a semi-auto rifle with a 16" barrel and a 30+1 round capacity.
Q: Does the Diamondback DB15USLB come with sights?
A: No. It has no sights, so you will need to add an optic, iron sights, or both.
Q: Is the DB15USLB direct impingement or piston?
A: Direct impingement. It uses a carbine gas system.
Q: What is the barrel twist rate on the DB15USLB?
A: 1:8". The barrel is 4150 chrome moly and 16" long.
Q: Does the DB15USLB have a forward assist?
A: No. This rifle does not have a forward assist. It does have a manual safety.
Warranty and Manufacturer
Covered by the Diamondback Firearms factory warranty; warranty terms come from Diamondback Firearms.
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