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Rainier Arms, LLC

Rainier Arms Mountain Series Cold Hammer Forged Barrel 5.56mm NATO

Rainier Arms Mountain Series Cold Hammer Forged Barrel 5.56mm NATO

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Rainier Arms Mountain Series CHF Barrel 5.56mm Nato

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: 14.5 Mid Gas, 16 Mid Gas, or 18 Rifle Gas
  • Barrel Profile: Modified Mid Weight Government Profile or Government Profile (STD)
  • Twist Rate: 1:7
  • Muzzle Thread: 1/2x28 TPI (Threads Per Inch)
  • Diameter At Gas Block: .750
  • Bore: Chrome Lined
  • Chamber: 5.56mm NATO
  • Made in the USA


  • 14.5 MW - 1 lbs 8.4 oz
  • 16 MW - 1 lbs 9.8 oz
  • 16 - 1 lbs 11.4 oz
  • 18 MW - 1 lbs 12.4 oz
  • 18 -  1 lbs 13.1 oz


Additional Info

Additional Info

Manufacturer Rainier Arms, LLC
Finish Black
Gas Length No
Caliber 5.56



Feel free to ask us any question regarding this product.