Sig Sauer NG556-QD | 5.56 NATO Suppressor | Clutch-Lok QD

The Sig Sauer NG556-QD is a full-size rifle suppressor from the SLX/Next Gen family designed for use with 5.56-caliber platforms. It uses a monolithic core manufactured from Inconel and a Clutch-Lok quick-detach interface for secure, repeatable attachment. The design emphasizes flash reduction and lower toxic fume exposure for semi-automatic carbines while maintaining durability and reliability. The suppressor is suited for range training and precision rifle work where repeatable mounting and reduced muzzle signature are priorities.

Product Specifications

• The manufacturer is SIG SAUER.
• The model is NG556.
• The manufacturer’s part number is NG556-QD.
• The UPC is 798681700301.
• The caliber is listed as .223 Rem/5.56 NATO.
• The overall length is 7.4 inches.
• The weight is 19.4 oz.
• The construction material is Inconel.
• The finish is Cerakote (black).
• The outside diameter is 1.67 inches.
• The NFA thread pattern is 1/2×28.
• The attachment method is Clutch-Lok quick-detach.
• The suppressor includes Quick Detach Mount/Muzzle Brake.
• Additional features include a monolithic core and a flash-reducing end cap.
• The ATF type is listed as SILENCER.

Built for users who demand durable, repeatable performance, the NG556-QD pairs high-temperature Inconel construction with an additive-manufactured monolithic core and Sig Sauer’s Clutch-Lok QD system. Its flash-reducing end cap and internal multi-flow paths are intended to lower visible signature and reduce backflow of gases in semi-auto carbines, making it well suited to extended range sessions and precision applications. The unit’s overall size and mounting system provide a balance of robustness and convenient field attachment.

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