Description
The HRT-556™ AM Silencer is a highly durable, low backpressure 5.56mm suppressor constructed from Griffin’s proprietary Nickel 625X™ powder alloy utilizing state-of-the-art DMLS additive manufacturing technology. This iteration of the HRT-556 Silencer shifts priorities to deliver an ultra low backpressure unit optimized for hard use while offering high levels of sound and flash reduction performance. Left handed shooters will benefit from the very low backpressure stack as well as right handed shooters.
These silencers are built on Griffin’s rock-solid DUAL-LOK® mounting system which has become one of the most trusted active-locking mounting systems preferred by law enforcement and military professionals. This advanced mount provides exceptional accuracy with minimal and repeatable POI shift, and completely eliminates the fear of unintended loosening during prolonged courses of fire.
The proprietary, patent-pending Nickel 625X™ alloy showed in testing a ~68% increase in yield and tensile strength over additively manufactured INCONEL® 625 at 1200°F. INCONEL® 625 is a commonly used suppressor alloy in current next generation military suppressors. Additively manufactured Nickel 625X™ is stronger at 1472°F than INCONEL® 625 cold formed sheet material at room temperature. INCONEL® 625 cold formed material provided adequate service in the last several decades of military suppressors.
Features
- Integrated DUAL-LOK® Mounting System
- Low Backpressure Baffle Stack
- Additive Manufacturing
- Ultra-Durable Nickel 625X™ Alloy Construction
- Printed Core Laser-Welded to Machined Rear for Warranty Serviceability
- Low Backpressure Flash Hider End Cap
- Highly Accurate with Minimal POI Shift
- Perpetual Lifetime Warranty™
What’s in the Box
- DUAL-LOK® HRT-556™ AM Silencer (.22cal)
- DUAL-LOK® EZ-Brake™ Muzzle Device (1/2×28 – .22cal)
- Branded Griffin Silencer Pouch
AVAILABLE MAINTENANCE ITEMS:
- DUAL-LOK® Wrench
- Griffin GI Armorers Wrench
- Mount Adapter Driver
- Cleaning Brushes
- ST-3 Thread Sealant
- High Temp 2300 degree Anti Seize
- Alignment Rods (to verify proper installation)
Digital Manual
- CLICK HERE FOR MANUAL
Ratings & Restrictions
- DUAL-LOK® 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!
INCONEL® is a registered trademark of Special Metals Corporation. Griffin Armament has no affiliation with Special Metals Corporation, and the use of “INCONEL®” is in this document is only for purposes of comparison between materials.







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