The Radical Defense CS-5 Black is a compact 5.56mm suppressor on a hub mount, packaged with a KFM flash hider threaded 1/2×28 (brand part no. CS5). The flash hider goes on the barrel and the suppressor locks onto it, so the can comes off without disturbing the muzzle device. Its short body suits 5.56 carbines and short-barreled rifles that would feel front-heavy and long with a full-size can. The black finish is the standard match for most AR-15 builds. It is a compact, ready-to-mount option for a 5.56 rifle with a standard 1/2×28 muzzle.

Key Specifications

• Caliber rating is 5.56mm, the chambering behind most AR-15 carbines.
• The body is a compact design, so a short-barreled rifle stays maneuverable with the can attached.
• Mounting is through a hub mount, the interface the suppressor uses to lock onto its flash hider.
• A KFM flash hider is included and serves as the muzzle-side attachment point.
• The flash hider is threaded 1/2×28, the standard 5.56 AR-15 muzzle thread.
• The finish is black, matching most AR-15 receivers and furniture.
• Because the can mounts to the flash hider, the flash hider stays on the rifle when the suppressor is removed.

Frequently Asked Questions

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Does the CS-5 come with a flash hider? Yes. A KFM flash hider threaded 1/2×28 is included, and the suppressor mounts to it rather than to the bare barrel.

Is there an FDE version of this suppressor? Yes. Radical Defense also makes the CS-5 Compact in Flat Dark Earth. This one is black.

Buy the Radical Defense CS-5 Compact Suppressor, 5.56mm, Hub Mount, Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. With the KFM flash hider included, it is ready for any 5.56 barrel threaded 1/2×28. Order through Radical Defense‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.