Sig Sauer NG556C-QD SLX Compact Suppressor – 5.56 NATO

The Sig Sauer NG556C-QD is a compact SLX-series rifle suppressor designed for use with .223 Rem / 5.56 NATO cartridges. It features an internal multi-flow path for reduced backflow and flash, and incorporates the Clutch-Lok quick-detach mounting system for repeatable attachment. The tube and core are Inconel construction intended to provide high-temperature durability in a short, lightweight package. Specifications across source documents are generally consistent for length, diameter, material, and attachment, while weight information varies and is flagged for verification.

Key Specifications

• The caliber is .223 Rem / 5.56 NATO.
• The build material is Inconel.
• The overall length is 5.2 inches.
• The outside diameter is 1.67 inches.
• The attachment system is the Clutch-Lok QD quick-detach mount.
• The ATF model designation is NG556C-QD.
• The ATF manufacturer is SIG SAUER.
• The NFA thread pattern is 1/2×28.
• The finish is High Temp Cerakote.
• The product type is listed as NFA – Silencer.

With a short profile, durable Inconel construction and a clutch-style quick-detach interface, the NG556C-QD is well suited for users who want a compact, low-profile suppressor that reduces flash and backflow while adding minimal overall length to the host rifle. Its SLX design focuses on practical field performance and repeatable attachment in demanding use cases.

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