11.5" 5.56 Combat Grade Barrel

On sale: $202.88
In Stock
Part Number:115-556-CGB

Modern Armory Combat Grade Barrels are 100% USA Made and are individually inspected to ensure it meets its required specifications. 

ALL MA Barrels come with a Lifetime Guarantee to be free from manufacture defects.

All NFA/ATF Rules Apply

You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm.

  • 11.5" Government Profile
  • 5.56 NATO
  • 4150 CrMoV Steel (Chrome Moly Vanadium per MIL-B-11595E)
  • 1:7 Twist Rate
  • Mil-Spec 86L20 case hardened M4 extension with polished Feed Ramps
  • 1/2- 28 Threaded muzzle
  • Carbine Gas System
  • Gas port .069" diameter
  • .750 Gas Journal 
  • Pinned Nitride Gas Block
  • Dimpled & drilled for pinnable Gas Block
  • Knurled set screws
  • 5/64 Stainless Coiled Roll Pin
  • 1/8 Stainless Coiled Roll Pin
  • Fully stress-relieved barrel
  • Magnetic Particle Inspected (MPI)
  • H&M Black Nitride finish 
  • Weight 21.5 ounces

*Lifetime Guarantee covers manufacturing defects in materials and workmanship, regardless of the age of the product, but it does not cover normal wear and tear. Wear and tear is damage that naturally and inevitably occurs as a result of normal use.

The use of reloaded or remanufactured ammunition will void the warranty, due to the unpredictability of the standards (SAMMI/NATO) adhered to, since reloads of poor quality ammunition may not meet (SAMMI/NATO) specifications, may exceed limits, and therefore may be unsafe.

ITAR: International Traffic in Arms Regulations Controlled Product

5 Stars
Owner/Sr Armorer
With 15 years in the gun building business, you almost never come across a barrel and bolt carrier with such attention to detail, the gasport value, head spacing, fitment tolerances finish, Etc there's not enough room to go into detail with all of the little nuances that were put into this. However these barrels usually run on a very strong full power spring like an orange spring from sprinco or at least a blue spring. This barrel was tuned so perfectly that it ran with a sprinco white spring and an H2 buffer which is incredible given the dwell time pressures Etc! I think I just found a new vendor for all of my law enforcement and duty builds.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Florida. on 7/17/2022
5 Stars
Fantastic barrel
Don absolutely knocks these out of the park. Quality is fantastic, feed ramp polishing is top notch. Couldn’t be happier.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Soflo . on 5/26/2021

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