Diamondback DB175AK621 DB15 | 5.56 NATO | 16″ | 30+1

The Diamondback DB15 (DB175AK621) is a semi-automatic AR-pattern rifle built on 7075-T6 aluminum receivers with a medium 4150 chrome moly barrel and a mid-length gas system. It ships with a 15″ slim M-LOK V-Rail handguard, Magpul CTR stock and K2 grip, and a CNC DBSB-IV flash hider; the lower is finished in Diamondback Gold with black furniture. For an optic choice under $1,000, a Vortex Strike Eagle 1-6x provides a versatile 1-6x magnification range that pairs well with the 16″ barrel for engagements from close to intermediate distances.

Recommended uses include precision-oriented range practice and competitive pistol-caliber rifle style sport shooting or target events. The configuration balances fieldable ergonomics with accessory compatibility for common AR setups.

Product Specifications

• The rifle weighs 6.80 lbs for a balance of carryability and stability.
• The listed weight range is 6 lbs to 6.99 lbs.
• This model is configured for Right Hand operation.
• The action type is Semi-Auto.
• The barrel is described as Threaded.
• The barrel length is 16″.
• The caliber/gauge is .223 REM/5.56 NATO.
• The magazine capacity is 30 + 1.
• The finish is a Digital Camouflage style.
• The muzzle device is a CNC DBSB-IV Flash Hider.
• The overall length is 32.75″ – 36″ depending on stock position.
• The receivers are constructed from Aluminum.
• The stock installed is a Magpul CTR.
• The trigger is a Mil-Spec unit.
• The rifling twist rate is 1:8″.
• The UPC is 810035756113.

The DB15 DB175AK621 is a straightforward, spec-driven AR built for reliability and accessory flexibility. Its 16″ mid-length gas system and 15″ M-LOK handguard make it adaptable for optics, lights, and foregrips while retaining a compact feel for range use. The combination of a 4150 chrome moly barrel and a Mil-Spec bolt carrier group supports consistent performance across common 5.56 loads.

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