Diamondback Firearms DB15 5.56x45mm 16" AR Rifle - Black (Model: DB1731K071)

The Diamondback Firearms DB15 5.56x45mm 16" AR rifle delivers solid, no-nonsense performance built right here in the USA. This mid-length gas system rifle combines proven mil-spec architecture with quality components machined in Diamondback's own CNC facility, giving you a versatile platform that handles range days, hunting, or home defense without the bloat of unnecessary features or the sticker shock of premium brands. If you want an AR that just works and won't break the bank, the DB15 in black is a straightforward choice for shooters who value reliability over hype.

The heart of this rifle is its forged 7075 T-6 aluminum upper and lower, paired with a 16-inch Diamondback 4150 CrMov barrel finished in black nitride—a time-tested combination that's proven across millions of military and civilian rifles. The mid-length gas system keeps things running smooth across a wide range of ammunition, and the 1:8 right-hand twist stabilizes both lighter and heavier 5.56 rounds. A shot-peened and magnetic particle inspected mil-spec bolt carrier group ensures durability, while the Diamondback CNC DBSB IV flash hider with 1/2x28 threading rounds out the barrel for cleaner muzzle behavior on the range.

Ergonomics lean practical: the Magpul MOE-K2 grip sits naturally in your hand, the Magpul CTR stock adjusts from 32¾" (collapsed) to 36" (extended) for fit and storage flexibility, and the Diamondback 15 M-LOK handguard with anti-slip texture pads gives you solid purchase and easy accessory mounting. You get a 30-round GEN 2 PMAG and standard trigger out of the box—nothing fancy, everything functional. At 6.8 pounds, it's light enough for extended shooting sessions without feeling cheap. Like most modern AR-15s, the DB15 plays well with the ecosystem of aftermarket parts and accessories, so customizing to your exact needs down the road is straightforward.

Key Features

• Forged 7075 T-6 aluminum upper and lower receivers for lightweight strength
• 16-inch Diamondback 4150 CrMov barrel with black nitride finish and 1:8 RH twist
• Mid-length gas system for reliable cycling across ammunition variations
• Mil-spec bolt carrier group with shot-peening and magnetic particle inspection
• Diamondback 15 M-LOK handguard with anti-slip texture for accessory mounting and control
• Magpul MOE-K2 grip and Magpul CTR stock with adjustable length of pull (32¾" to 36")
• Diamondback CNC DBSB IV flash hider (1/2x28 threading)
• Includes 30-round GEN 2 PMAG and standard trigger
• USA-made components manufactured in Diamondback's CNC facility
• Compatible with standard AR-15 accessories and parts

Specifications

Frequently Asked Questions

Is the Diamondback DB15 compatible with standard AR-15 accessories?

Yes. The DB15 follows mil-spec architecture and works with most AR-15 aftermarket parts and accessories, so you can customize it to your needs with grips, optics mounts, rail systems, and other common components.

What's included in the box?

The rifle comes with a 30-round GEN 2 PMAG and is ready to shoot out of the box with its standard trigger and factory sights.

What gas system does this rifle use?

The DB15 features a mid-length gas system, which is designed to cycle reliably across a wide range of 5.56 NATO ammunition without being overly aggressive.

Can I adjust the length of the stock?

Yes. The Magpul CTR stock adjusts from 32¾ inches (fully collapsed) to 36 inches (fully extended), allowing you to customize the fit for your body size or when wearing body armor.