Diamondback DB15 Extended Line 5.56 NATO AR-15, 16 in Nitrided Threaded Barrel, 15 in M-LOK Handguard, Black
This Diamondback DB15 Extended Line is a full-size 5.56 NATO AR-15 featuring a 16 in 4150 CrMoV nitrided, threaded barrel with a 1:8 RH twist and carbine-length gas system. It pairs forged 7075-T6 aluminum receivers with a 15 in free-float M-LOK handguard and a continuous T-marked Picatinny top rail. This example is in excellent condition with an excellent, mirror-bright bore and includes the factory box, manual, and a 30-round Magpul PMAG.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm displays only light signs of wear and handling. Minor surface scratches mark the metal in a few spots. It remains clean overall.
What’s Included
- 1x 30-round Magpul PMAG Gen M2 MOE polymer AR/M4 magazine
- Diamondback Firearms DB15 owner's manual
- Diamondback factory cardboard box
The 16 in barrel is made from 4150 CrMoV steel, finished in a durable nitride treatment, and threaded 1/2x28 with an A2 flash hider installed. Its 1:8 RH twist supports a wide range of 5.56 NATO bullet weights, and the carbine-length gas system provides the classic AR-15 operating layout.
A 15 in free-float M-LOK aluminum handguard offers modern accessory mounting along the sides and bottom. A continuous, T-marked Picatinny top rail runs across the receiver and handguard for uninterrupted alignment. The ejection-port cover is marked "5.56 NATO."
The receiver set is forged 7075-T6 aluminum with a black hardcoat anodized finish. This example uses Diamondback's forged "Diamondback Carbon" lower variant and is marked with the manufacturer location in Cocoa, Florida, USA. It accepts standard AR-15 pattern detachable magazines.
Furniture includes a 6-position collapsible polymer stock in black and a Magpul MOE pistol grip. Weight is approximately 6.6 lb, with an overall length of about 32.5 in when collapsed. A manual safety provides familiar AR controls.