SOFR Upper Assembly 11.5” 5.56 (Suppressor Only) – BCM MCMR 10.5" MLOK

Overt Industries

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Overt Industries SOFR - 11.5” 5.56 Suppressor Only Fighting Rifle Upper – BCM MCMR 10.5" MLOK

  • Overt Industries 11.5” 5.56 NATO SOB (Suppressor Only Barrel)
  • Overt Industries Thermal Fit Upper Receiver
  • BCM Gas Block & Fighting Rifle Melonite Gas Tube
  • BCM MCMR 10.5" MLOK Rail


Assembly Process

This Upper Receiver assembly was properly assembled using Aeroshell 64 on the barrel extension and barrel nut after the threads were properly seasoned. The barrel was also properly dimpled using a BRD Engineering Pro Jig and the gas block set screws were tightened using Rocksett for maximum reliability at high temperatures. The handguard was assembled using Loctite 242 on the rail mounting bolts.

Barrel Specifications

Shooting a suppressed rifle offers many advantages to the end user, such as enhanced signature management, improved recoil impulse, and decibel reduction. However, suppressing a gas impingement AR15 does create some disadvantages due to the increased gas blowback that most suppressors create. The Overt Industries SOB Barrel line solves these issues and offers a reduced barrel gas port diameter that is optimized for the increase in gas blow back. This results in less gas in the face of the end user and improving felt recoil and the need for additional adjustable gas system components.

We’ve found that when most end users start shooting suppressed, they often never shoot without a suppressor and prefer a barrel that is appropriately gassed for their use case. These requests resulted in a limited run of Suppressor ONLY Barrels. 

Gas Port Diameter = 0.0625" 

Unlike other companies, we publicly disclose our gas port diameter so you, the end user knows exactly what they are purchasing. As shooters, we were frustrated when companies refused to disclose their gas port diameters and we were left to purchase barrels hoping for a desired result.  

  1. Unparalleled Suppressor Compatibility: Our barrel is designed with suppressor use in mind, featuring a conservative gas port size that provides a soft, flat shooting recoil impulse and less gas to the end user's face with their suppressor. We recommend a Standard Carbine 17-7 Steel Spring or Sprinco Blue & H Weight (3.7oz) Buffer or a Standard A2 17-7 Steel Spring or Sprinco Green & A5H1 for most suppressor applications, however for newer reduced blowback suppressors, a Standard (3oz) or A5H0 buffer, however we recomend a stand SOB barrel for flow through suppressors. This barrel is designed for SUPPRESSOR ONLY applications.
  2. Premium Materials: Crafted from high-quality, precision-machined stainless steel, our barrel is built for hard use. It's corrosion-resistant, durable, and capable of withstanding the rigors of extended use. 
  3. Precise Rifling: The barrel boasts precise 1:7 twist rifling, optimizing stability and accuracy with a wide range of bullet weights. Whether you're shooting lightweight varmint rounds or heavier match ammunition, expect exceptional accuracy downrange.
  4. Versatile 5.56 NATO Chamber: Our barrel is chambered in 5.56 NATO, providing the versatility to shoot both 5.56 NATO and .223 Remington ammunition. Enjoy the convenience of switching between these popular calibers without compromising performance.
  5. Optimized Length: At 11.5" inches, this barrel balances the benefits of short overall length without sacrificing velocity. It's ideal for close-quarters engagements while maintaining the accuracy and velocity needed for longer-range shots. 
  6. Overt Industries Reliability: Overt Industries is known for its commitment to quality and innovation. We 100% QC every SOB barrel and ensure that the gas port diameter is within 0.001" of our specification of 0.0625". Our suppressor-only barrel is no exception, embodying our Hard Use - Zero Sacrifice Ethos. 

Our barrels include one gas block set screw dimple located directly under the gas port for enhanced durability and compatibility with industry standard gas blocks. 


Length  11.5″
Weight 20.8 Oz
Material 4150 CMV
Profile M4
Caliber 5.56 NATO
Twist 1/7
Muzzle Device Thread 1/2x28
Gas Block Journal 0.750"
Gas System Carbine
Finish Nitride


Note this barrel is optimized for suppressor use with M193, M855, & MK262 ammunition, shooting without a suppressor or with lower pressure ammunition may result in varying performance. NFA Rules Apply. 


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