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Plan your Class 3 dealer
Suppressors go through a Class 3 (SOT) dealer, and the federal tax on them has been $0 since January 1, 2026. You still pay the dealer's transfer fee. Some states only allow suppressors and SBRs that are federally registered or possessed in compliance with federal law. Check your state's statute before you buy.
Federal and state suppressor rulesKnights Armament
Overview
The KAC 556QDC/CQB Suppressor is designed specifically for the 5.56 NATO caliber, offering builders a robust solution for reducing sound signature while maintaining accuracy and reliability. Its quick detach mount type allows for efficient installation and removal, making it ideal for dynamic shooting environments where adaptability is key. This suppressor is commonly found in builds aimed at tactical applications or those requiring versatility in various shooting scenarios.
Specifications
Build history on GunPartPicker
Builders have added the Knights Armament KAC 556QDC/CQB SUPPRESSOR Black to their builds on GunPartPicker. Since April 2026, it ranks #59 of the 519 suppressors builders have added. Builds with this suppressor are nearly all chambered in 5.56 NATO, split between mid-length (40%) and rifle-length (40%) gas systems, and mostly AR-15 (91%, then AR-9 9%).
It was out of stock everywhere we track every time we checked in October 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $1,442.70 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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We ranked every suppressor by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Suppressor Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Aimpoint Micro T-2 Red Dot Sight with 2 MOA Dot Matte Black
SureFire M340C Mini Scout Light PRO Weapon Light - 500 Lumens - Black
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Bravo Company Manufacturing 14.5" 5.56 NATO 1:7 Mid-Length Government Contour AR-15 Barreled Upper - 13" M-LOK MCMR Rail
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the KAC 556QDC/CQB SUPPRESSOR BLK
| Build | Parts | Total |
|---|---|---|
 | 9 | $4459.55 |
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