The Radical Defense CS-5 Compact FDE is a short 5.56mm suppressor finished in Flat Dark Earth and built on a hub mount (brand part no. CS5-FDE). Its thread pattern is 1/2×28, the standard muzzle thread on 5.56 AR-15 barrels. The compact length is aimed at carbines and short-barreled rifles, where a long can makes the rifle awkward to handle. Radical Defense offers the same CS-5 in black, so this tan version is the one to choose for an FDE build. It is a straightforward way to quiet a 5.56 AR without stretching it out.

Key Specifications

• Caliber rating is 5.56mm, the cartridge most AR-15 carbines are chambered for.
• The body is a compact design, which keeps a short-barreled 5.56 easy to handle with the can mounted.
• Mounting is through a hub mount, the interface the suppressor uses to attach to its muzzle device.
• The thread pattern is 1/2×28, the standard muzzle thread on 5.56 AR-15 barrels.
• The finish is Flat Dark Earth, a tan color that sets this version apart from the black CS-5.

Frequently Asked Questions

What color is this CS-5? Flat Dark Earth. The CS-5 Compact is also made in black, which is a separate product.

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.

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

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. Match it to a 5.56 rifle threaded 1/2×28 and the compact body keeps the whole setup short. Order through Radical Defense‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.