Rainier Arms Mountain Series Cold Hammer Forged Barrel 5.56mm NATO - 16 Mid Weight

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Rainier Arms Mountain Series Cold Hammer Forged Barrel 5.56mm NATO - 16 Mid Weight


Rainier Arms Mountain Series CHF Barrel 5.56mm Nato 16" Mid Weight Profile

Rainier Arms Mountain Series CHF Barrels are built to be of the highest quality, extremely durable and long service life. Cold Hammer Forging of barrels has been known to produce accurate and longest lasting rifle barrels obtainable. The process also creates a defect free bore and the most consistent chamber possible. Many have trusted CHF barrels to be part of their foundation when building their duty rifle.


  • Barrel Material: Chrome Moly Vanadium Steel
  • Made of Mil Spec M249 Machine Gun barrel steel, with heavy M249 Chrome Lining, (appx. 2 times as thick as an M4 or M16)
  • Barrel Type: Cold Hammer Forged
  • Barrel Caliber: 5.56mm NATO Barrel
  • Barrel Length: 16"
  • Barrel Profile: Modified Mid Weight Government Profile
  • Barrel Gas System: Mid Length
  • M4 Feed ramps
  • Twist Rate: 1:7
  • Muzzle Thread: 1/2A~—28 TPI (Threads Per Inch)
  • Diameter At Gas Block: .750
  • Bore: Chrome Lined
  • Chamber: 5.56mm NATO
  • Weight: 1 lbs 9.8 oz
  • Made in the USA

Our Craftmanship Guarantee

We are so confident in the craftmanship of our barrels, if our barrel doesn’t outshoot your similar priced barrel, send it back for a full refund. While most companies strive for faster production time to cut cost, we strive only for quality. Our barrels are made the old-fashioned way by True Barrel Artisans™. Every barrel is carefully chambered & crowned by hand. We have a few secrets up our sleeves that no CNC machine can reproduce. There are no shortcuts with our barrels, period.

We will go toe to toe with anyone and win.

More Information
Manufacturer Rainier Arms, LLC
Finish Stainless Steel
Barrel Length 16"
Profile Midweight
Gas Length Mid
Caliber .223 / 5.56