The Knights Armament QDSS NT-4 (brand part no. 121569-BLK) is a quick-detach sound suppressor built for 5.56 NATO rifles, finished in black for a low-visibility, mil-spec look. Knights Armament designs the QDSS line around fast, tool-less mounting and dismounting, letting shooters move the can between compatible rifles without re-zeroing a fixed thread mount every time. It’s a straightforward pick for 5.56 shooters who want a suppressor built to Knights Armament’s established quick-detach standard. As a Title II item under the National Firearms Act, it requires an approved ATF Form 4 and transfer through a licensed NFA dealer before it can go home with you.

Key Specifications

• Rated for 5.56mm NATO rifles.
• Uses a quick-detach mounting system.
• Finished in Black.

Frequently Asked Questions

Is this an NFA item? Yes. As a suppressor, it’s a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

Does it mount and dismount without tools? Yes, the QDSS quick-detach system is built for fast, tool-less mounting and dismounting.

Buy the Knights Armament QDSS NT-4 Suppressor

A quick-detach 5.56 NATO suppressor built to Knights Armament’s mil-spec standard is exactly what the QDSS NT-4 delivers. This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through Knights Armament‘s suppressor lineup and our Lubbock, Texas team will walk you through the transfer process.