Griffin 14.5" 416R 223 Wylde HEDP Barrel

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The Griffin HEDP™ Barrels provide High Endurance Dual Purpose functionality- offering high durability and precision accuracy. Nitrided 416R stainless steel provides the highest possible hardness and longest throat life available with match grade bore dimensions and bore finish. HEDP barrel bores are hand lapped, ensuring batch to batch consistency and accuracy. TRUE-BORE™ concentric suppressor grade threads provide an optimized thread interface for your silencer regardless of brand or model. M4 feed ramps and chambers are polished prior to nitriding for smooth reliable feeding, chambering, and extraction. Gas ports were carefully engineered to provide reliable function suppressed or unsuppressed with 5.56 NATO ammunition. M4A1 contour diameter between the chamber and gas block for minimal POI shift with suppressors and maximum accuracy and durability while maintaining field weight. The included 416R Low profile Griffin Armament Primo Gas Block offers unmatched value in the interest of increased customer satisfaction. Threads are slotted for pinning and welding your favorite Griffin Armament muzzle device.

The overall length of this 416R 223 Wylde HEDP Barrel is 14.8" This allows for the pinning and welding of a Gate-LOK™ Hammer Comp 5.56mm 1/2x28 with included stop washer to achieve the 16" minimum barrel length requirement to not be classified as an NFA SBR. An A2 length device with a crush washer could also be used to achieve the minimum 16" barrel length requirement, however, this application is not recommended for use with suppressors as the crush washer can compromised bore concentricity. 

5R rifling is believed by many to be superior to conventional rifling, reducing bullet deformation, and barrel fouling, affording more consistent accuracy, reduction of wear (greater life), and greater ease of cleaning.  5R rifling was used in the legendary Army M24 Sniper Weapon System (SWS) and those rifles were found to meet or exceed accuracy requirements at over 20,000 rounds fired.  

The PRIMO Gas Block can be pinned by a trained gunsmith. Alternatively end users can quickly mount their block with the included set screws. Proficient builders should use a carbide tipped 1/8" drill bit to complete the pin hole prior to pressing the included splined pin. (splined pin installation is optional)

Barrel weight is 31.7oz


  • 14.8" barrel length 

  • 416R SS barrel manufactured from stress relieved certified barrel steel

  • Black nitrided for extended service life

  • Magnetic particle inspected

  • Button rifled

  • 5R rifling offering less constriction on the bullet

  • 223 Wylde chamber for optimal accuracy

  • Mid length gas for softer recoil characteristics

  • .750" gas block journal

  • M4A1 diameter for reduced POI shift / Increased Accuracy & Durability

  • Air gauged and hand lapped bore

  • Polished chamber and M4 feed ramps

  • TRU-BORE suppressor quality threads

  • Suppressor optimized gas ports

  • .625" , 1/2x28 industry standard threads

  • Threads pre-slotted for pin and weld applications

  • Included 416R Low Profile PRIMO Gas Block

  • Barrel weight : 31.7oz 

  • 33.2oz weight (with gas block installed)

  • 1/8 Twist

5.56mm (.223)
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