16″ 5.56 NATO 1/7 AR-15 Barrel – 4150 CMV Nitride, Carbine Length Gas System
Looking for a dependable, hard-use AR-15 barrel that balances durability, accuracy, and reliability? This 16″ 5.56 NATO barrel from Mid State Firearms is built to perform under real-world conditions—whether you’re running drills, building a duty rifle, or upgrading your current setup.
Precision-machined from 4150 Chrome Moly Vanadium steel, this barrel is engineered for strength and longevity. The salt bath nitride finish enhances surface hardness, corrosion resistance, and wear life—without the downsides of traditional chrome lining.
Built for Reliability
The carbine-length gas system delivers consistent cycling across a wide range of ammunition types, making it a proven choice for shooters who value reliability above all else. Combined with M4 feed ramps, this barrel ensures smooth feeding and dependable operation.
Ready-to-Install Performance
Save time and ensure proper alignment with a pre-dimpled gas block journal—perfect for secure gas block installation without guesswork.
Key Features
- Caliber: 5.56 NATO (compatible with .223 Remington)
- Barrel Length: 16″
- Twist Rate: 1:7 (stabilizes a wide range of bullet weights, including heavier projectiles)
- Material: 4150 CMV (Chrome Moly Vanadium Steel)
- Finish: QPQ Nitride (Salt Bath Nitride)
- Gas System: Carbine Length
- Gas Block Journal: .750″ with pre-dimple for easy installation
- Thread Pitch: 1/2×28 (compatible with standard muzzle devices)
- Feed Ramps: M4
- Platform: AR-15
Why Choose a 4150 CMV Nitride Barrel?
When it comes to longevity and performance, 4150 CMV steel stands above standard barrel steels. Paired with a nitride treatment, you get:
- Increased surface hardness for extended barrel life
- Superior corrosion resistance
- Easier cleaning and maintenance
- Durable wear resistance under high heat and rapid fire
Ideal For:
- Duty or defensive rifle builds
- Range and training setups
- Budget-conscious builders who still demand premium materials
- Shooters running heavier grain 5.56 projectiles
Upgrade Your Build
Whether you’re starting a new build or replacing a worn-out barrel, this 16″ 5.56 NATO AR-15 barrel delivers the performance and durability serious shooters expect—without unnecessary markup.
Explore more AR-15 components at Mid State Firearms:
sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.