DUAL-LOK™ Flash Suppressor (2.75") 5.56mm 1/2x28

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Griffin Armament is proud to introduce DUAL-LOK™, our newest QD mounting system for rifle suppressors. The DUAL-LOK™ system is comprised from two parts, the DUAL-LOK™ Mount and the DUAL-LOK™ muzzle device (of your choice). This page is for the DUAL-LOK™ Stealth Flash Suppressor (2.75"). 

The muzzle device integrates 60 machined mounting position grooves, which is doubled by the mount’s two locking positions, hence the double entendre DUAL-LOK™. How is this achieved? The mounts’ two locking positions are machined out of phase of one another by 3 degrees which provides the 120 effective locking positions and ensures a tightly mounted and locked suppressor.  When the suppressor is installed, only one of the two positions will generally function by allowing the spring to push the locking collar rearward over the splines. 

Time intensive R&D resulted in a high performance 3 prong flash hider with incredible resonance reduction. These suppress flash extremely well and do not ring or ping when fired, hence "stealth". CNC Machined of heat treated 17-4 ph stainless steel material and PVD DLC coating ensures durable, corrosion free service life.

Diameter: 1.07" [grooves] .93" [unit]
OAL: 2.75"

4.1 oz

Materials: 17-4PH Stainless Steel
Finish: PVD DLC


  • Utility patent pending 
  • Wear free mounting system, requires no consumable parts
  • Anti-Resonance flutes to prevent pinging under fire
  • Taper lock interface ensures security and accuracy
  • 120 effective positions ensure a rock-solid suppressor mount and provide extremely low POI shift 
  • 2.75" length
  • Pre-drilled for pinning & welding 13.7" barrels to 16" OAL
  • 17-4 PH Stainless steel
  • PVD DLC coating for increased surface hardness, corrosion, and wear resistance
  • 3/4" wrench flats on muzzle devices 
  • 5/8" wrench flats on rear extension
  • No timing or shims required
  • 5.56mm 1/2x28

From our research contacting bona fide barrel manufacturers, this device will get Rosco's 13.7" barrels (true length being 13.882") as well as Faxon's 13.9" barrels (true length being 14.025") to the required 16" minimum legal length. This device was designed to take Rosco's 13.882" to 16.02". 

Unfortunately, some of the companies we contacted for exact barrel measurements on their advertised 13.7" barrels failed to get back to us or refused to disclose the true barrel length for verification. For this device to get your advertised 13.7" barrel to the required 16", the barrel must be a minimum of 13.882" true length (assuming an industry standard 0.625" threading interface).


5.56mm (.223)
Thread Pitch:
Type Of Part:
Muzzle Device
Attachment System:

6 Reviews

  • 5
    Solid Device

    Published by Xzavier on 14th May 2024

    I’m glad I went with Griffin Armament for my 13.9. This device helped greatly with flash suppression, and interfaced with the Dual-Lok 5 seamlessly.

  • 5

    Published by Christopher Jerrett on 30th Apr 2024

    This muzzle device is absolutely solid. Great construction. Easy mounting/timing. Just waiting for my silencer to go with it.

  • 5

    Published by Ryan on 23rd Oct 2023

    Ballistic Advantage barrel meets 13.7”

  • 5
    Excellent flash hider

    Published by Ed S. on 22nd Aug 2023

    This is a great product, I cannot wait for my Dual Lok 5 to get out of jail

  • 5
    Best bang for your buck

    Published by Terrence Moore on 5th Aug 2023

    Two words, MUST HAVE!! Received this muzzle device a few days ago and setup on my 14.5, timed it, went to the range to shoot… immaculate!! I bought the tactical comp for my 300BLK and I can’t wait to put it on. I am definitely a fan of the brand.

  • 5
    2.75 Stealth

    Published by Ray C on 3rd Mar 2023

    Superb fit and finish. Lock up with the Blast Shield is perfect!