Diamondback Firearms DB15 5.56x45mm 16" AR-15 Rifle - Black (Model: DB1758K001)

The Diamondback Firearms DB15 5.56x45mm AR-15 rifle is a purpose-built platform for shooters who want a reliable, no-nonsense carbine without the frills or the premium price tag. This 16-inch rifle strikes a practical balance between maneuverability and velocity, making it equally at home on the range, in a defensive role, or as a hunting carbine for varmint and medium game. The DB15 arrives configured and ready to shoot, with quality components throughout that reflect Diamondback's reputation for honest engineering.

The heart of this rifle is a Diamondback 5.56 barrel with a 1:8 right-hand twist, set up in a mid-length gas system for smooth cycling and manageable recoil. The upper receiver is a forged 7075 T-6 aluminum A3 flattop—the flat-top design gives you mounting flexibility for optics and accessories. The lower is also 7075 T-6 forged aluminum with Diamondback's Diamond branding, paired with an enhanced skeletonized trigger guard for a modern aesthetic and reduced weight. A CMC 3.5-pound single-stage trigger breaks cleanly, supporting precision shooting without the stiffness of a heavy mil-spec trigger.

The 15-inch M-LOK handguard uses Diamondback's S-Rail anti-rotation design, so your accessories stay put. You get a Magpul MOE K2+ grip for control and a Magpul ACS-L stock that collapses to 34 inches for tight spaces or vehicle storage, then extends to 37.25 inches for a full cheek weld. The rifle ships with a Diamondback CNC muzzle brake (1/2 x 28 threaded) and a 30-round Gen 2 PMAG. Total weight is 6.95 pounds—light enough to carry all day, substantial enough to shoot predictably.

This is a rifle for people who shoot rather than collect—no iron sights, no rail covers, no surplus features. Add your own optic and you've got a versatile 5.56 platform that delivers honest value and proven reliability.

Key Features

• 5.56 NATO chambering with 1:8 twist rate for modern ammunition compatibility
• 16-inch Diamondback barrel with mid-length gas system
• Forged 7075 T-6 aluminum upper and lower receivers
• 15-inch M-LOK handguard with anti-rotation design
• CMC 3.5-pound single-stage trigger for clean breaks
• Magpul ACS-L stock (collapsible, 34–37.25 inches)
• Magpul MOE K2+ grip
• Diamondback CNC muzzle brake (1/2 x 28)
• Includes one 30-round Gen 2 PMAG
• 6.95-pound total weight
• Mil-spec carrier group with shot-peening and magnetic particle inspection

Specifications

Frequently Asked Questions

What's the difference between a 16-inch barrel and longer AR-15 carbines?

The 16-inch barrel on the DB15 is the most versatile AR carbine length—it's the legal minimum in most US states, and it offers a good compromise between velocity, handling, and accuracy. A 1:8 twist rate handles a wide range of 5.56 ammunition loads, from lighter practice rounds to heavier bullets for hunting or distance work.

Does the DB15 come with iron sights?

No, this rifle ships without integrated iron sights. The A3 flattop receiver is designed for optic mounting—you can add your own scope, red dot, or backup irons depending on your mission.

What accessories and optics will fit the DB15?

The M-LOK handguard accepts any standard M-LOK accessories. The flattop upper receiver supports any Picatinny rail-mounted optic. The buffer tube is a standard Magpul ACS-L, so aftermarket stocks are compatible. The muzzle brake is 1/2 x 28 threaded, matching most common suppressors and muzzle devices.

Is this rifle suitable for hunting?

Yes. The 5.56 NATO cartridge is effective for varmint and predator hunting, as well as medium-sized game in many states—check your local regulations. The 16-inch mid-length platform provides adequate velocity, and the clean 3.5-pound trigger supports accurate shot placement.