13.9" 5.56 SOB - AR15 Suppressor Optimized Barrel

Overt Industries

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Introducing the Overt Industries 13.9" 5.56 NATO AR-15 Suppressor Optimized Barrel (SOB)

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.

Gas Port Diameter = 0.073" 

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 Sprinco Blue & H Weight (3.7oz) Buffer for most suppressor applications, however for newer reduced blowback suppressors, a Sprinco White & Standard (3oz) buffer may be required. When shooting unsuppressed, performance can vary depending on the specific muzzle device and ammunition and you may experience cycling issues, or a failure of last round bolt hold open function - Keep in mind this barrel is intended for suppressor use but in most cases will still function unsuppressed. 
  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 13.9 inches, this barrel strikes the perfect balance between maneuverability and barrel length. It's ideal for close-quarters engagements while maintaining the accuracy and velocity needed for longer-range shots. Compatible with most common suppressor QD muzzle devices to achieve 16"+ length when pinned & welded to avoid an additional tax stamp & registration with the ATF. 
  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 0.073". Our suppressor-optimized 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  13.9″
Weight 26.3 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 Midlength
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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  • 5

    Posted by joshua griner on 10th Jan 2024

    Very impressed with the quality of the product , tolerances and fit are above industry standards to say the least

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