DUAL-LOK™ HRT-556™ (.22 cal)

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Initially designed for elite HRT unit’s, Griffin Armament’s HRT-556™ model is the shortest addition to the DUAL-LOK™ family of suppressors which has to this point not been available to the general public.  Griffin utilized the new DUAL-LOK™ active retention system with this suppressor, an often time demanded feature by government customers.  This combined with generations of R&D brought a compact, highly durable, low flash, and top performing suppressor to market for government customers.  Griffin is now releasing it to the commercial market. 

The HRT-556™ features the patent pending DUAL-LOK™ mounting system, an accurate, robust, reliable, and wear free system with robust muzzle device support.  The suppressor itself was designed to have minimal flash signature, despite its size, minimal weight, minimal POI shift, minimal gas blow back, maximum strength, durability, and sound performance.  This was a tough list of performance attributes to tackle, but Griffin succeeded by bringing unbeatable sound suppression and flash reduction to this compact suppressor. 

Baffle technology is carried over and tuned from the 4th generation Recce Suppressors, barrowing the ECO-FLOW™ patented feature that greatly increases performance. ECO-FLOW™ baffles reduce back-pressure, increasing flow, thus making the suppressor host firearm operating system more reliable and unaffected by the suppressor and providing cleaner breathing air to the operator’s face.  The patented low profile flash suppressing end cap further adds performance to the low flash baffle system. 

“I spent several months very focused on this project with our production managers and technicians making small changes to the baffle system, cutting the prototype parts, welding prototypes, then testing through our B&K pulse system, and repeating this cycle over and over and over.  I wanted the absolute best sound and flash performance in the smallest size possible.  Our team achieved it. I have never made so many prototypes for one series in the last 17 years as I did with the DUAL-LOK™ cans. Bringing together sound and flash performance, while retaining accuracy and durability in a package this small; we haven’t done it before. This little can has some of the best flash performance of any in our line, regardless of its size.  I’m really proud of what our team did here.”

– Austin, Lead Design Engineer, Griffin Armament 

DUAL-LOK™ suppressors are machined in Griffin’s Watertown Wisconsin facility by freedom loving Americans.  





The DUAL-LOK™ HRT-556™ suppressor is rated up to .22-250 REM.

DUAL-LOK™ HRT-556™ suppressors do not have minimum barrel length restrictions or constraints for rifle calibers. While longer barrels promote longer service life, there are no barrel length restrictions with this suppressor! 




Overall Length:


Length Added:

4.5" when using included Minimalist Brake, 3.5" when using longer devices




High strength, high temperature, corrosion resistant 17-4PH Stainless Steel & 718 Inconel


DUAL-LOK™ Mounts

DB Rating:

(135.6db) 11.5" Griffin MK1, (134db) 16” Griffin MK1


High Temp Cerakote

Full Auto Rated:




  • Utility patents pending 

  • Wear free mounting system, requires no consumable parts

  • Taper lock interface ensures security and accuracy

  • ACME thread provides speed of attachment

  • Locking ring incorporates 3 anti-rotation teeth to eliminate inadvertent loosening

  • 120 effective positions ensure a rock-solid suppressor mount and provide extremely low POI shift 

  • 17-4 stainless steel & 718 Inconel

  • Traditional Tube Design with internal flash hiding characteristics

  • Patent pending ECO-FLOW™ baffle system for reduced blow back

  • Patented flash reducing end cap

  • DUAL-LOK™ Minimalist Brake 1/2x28 5.56mm (.22 cal) Included

  • ¾” wrench flats on muzzle devices 

  • Collar Nitrided for increased surface hardness, corrosion, and wear resistance

  • Suppressor body H900 heat treated and Cerakoted 

  • Available in black or FDE

  • Perpetual™ Lifetime Warranty


Additional Details

5.56mm (.223 cal)
Attachment System:
User Serviceable?:

1 Review

  • 5
    Awesome can

    Published by Al Smith on 21st Sep 2022

    Love this thing. I got to shoot it at my dealer, its not out of ATF jail yet. Bought it after the first 5 rounds. It has way less blow back than my dead air can.

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