Diamondback Firearms Barrel 223 Remington 5 56 NATO 16 Threaded Barrel 1 2X28 Thread Pitch 1 8 Twist Black Nitride Finish Mid Length Gas System Fits AR Rifles 556M16M50B8R UPC 815875019077
Product Description
The Diamondback Firearms 16-Inch 5.56 NATO AR-15 Barrel (556M16M50B8R) is a high-performance, precision-machined replacement barrel engineered for duty, recreational, and custom AR rifle builds. Chambered in 5.56x45mm NATO (and fully backward-compatible with .223 Remington ammunition), this 16-inch barrel offers an ideal balance of velocity, maneuverability, and shot-to-shot consistency.
Precision-molded from 4150 Chrome Moly Vanadium (CMV) steel with a durable Black Nitride (QPQ Salt Bath Nitride) finish inside and out, the 556M16M50B8R provides superior wear resistance, corrosion protection, and bore longevity compared to traditional chrome lining. The 1:8 right-hand twist rate is exceptionally versatile, accurately stabilizing a wide spectrum of bullet weights ranging from light 55-grain plinking loads up to heavy 77-grain precision match projectiles.
Engineered with a mid-length gas system port location, this barrel reduces gas port pressure spikes during cycling, resulting in a smoother impulse, reduced recoil, and decreased wear on bolt carrier group components. Threaded in standard 1/2"-28 tpi with a 0.750" gas block journal, the Diamondback 16" barrel serves as a rock-solid foundation for custom AR-15 upper receiver assemblies.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fitment for standard Mil-Spec AR-15, M4, and AR-22 upper receivers. Requires a 0.750" gas block and mid-length gas tube (approx. 11.75" tube length).
- Ensure the host firearm upper receiver is completely clear, magazine removed, and working area verified free of live ammunition.
- Apply anti-seize grease to the external barrel extension and upper receiver threads prior to seating the barrel.
- Slide the barrel extension into the upper receiver socket, ensuring the barrel index pin aligns fully with the upper receiver alignment slot.
- Torque barrel nut to manufacturer specs (35–50 ft-lbs). Install a 0.750" low-profile or standard gas block onto the journal, securing with set screws or roll pins, and verify mid-length gas tube alignment into the upper receiver gas tube port.
Key Features
- 16-Inch 4150 CMV Construction: Crafted from high-grade 4150 Chrome Moly Vanadium steel for heat resistance and mechanical strength.
- Black Nitride (QPQ) Finish: Salt bath nitrided internal bore and external surface deliver superior barrel life and friction reduction.
- Versatile 1:8 Twist Rate: Optimized to stabilize a broad range of .223/5.56 bullet weights (55gr to 77gr).
- Smoother Mid-Length Gas System: Delivers reduced recoil velocity, softer bolt unlocking, and reduced system wear.
- Standard 1/2"-28 Threaded Muzzle: Compatible with a wide array of 5.56 muzzle brakes, flash hiders, and suppressor adapters.
Product Specifications
- Brand: Diamondback Firearms
- Model/Series: AR-15 16" Mid-Length Barrel
- MPN / SKU: 556M16M50B8R / 556M16M50B8R
- UPC: 815875019077
- Caliber: 5.56x45mm NATO / .223 Remington
- Barrel Length: 16.0 Inches
- Gas System Length: Mid-Length
- Gas Block Journal: 0.750 Diameter
- Twist Rate: 1:8" Right-Hand Twist
- Muzzle Thread Pitch: 1/2"x28 tpi
- Barrel Material: 4150 Chrome Moly Vanadium (CMV) Steel
- Finish/Color: Black Nitride (QPQ)
- Country of Origin: United States
