The Radical Defense LS-5 FDE is a 5.56mm rifle suppressor built on a hub mount and finished in Flat Dark Earth (brand part no. LS5-FDE). It comes with a KFM flash hider threaded 1/2×28, the standard AR-15 muzzle thread, and the suppressor locks onto that flash hider rather than the barrel. The LS series is the rifle line in Radical Defense’s range, meant for 5.56 rifles rather than the shortest carbines. The tan finish matches FDE rifles and furniture. It is a complete setup for a 5.56 AR that wants a matching tan can.

Key Specifications

• Caliber rating is 5.56mm, the chambering most AR-15 rifles use.
• It is a rifle suppressor in the LS line, sized for rifle-length 5.56 hosts.
• Mounting is through a hub mount, which locks the can onto its flash hider.
• A KFM flash hider is included, so the mounting hardware comes with the suppressor.
• The flash hider is threaded 1/2×28, the standard 5.56 AR-15 muzzle thread.
• The finish is Flat Dark Earth, a tan color for FDE builds.
• Because the can rides on the flash hider, the flash hider stays on the rifle when the suppressor comes off.

Frequently Asked Questions

Is a flash hider included with the LS-5? Yes. A KFM flash hider threaded 1/2×28 comes with it, and the suppressor mounts to that flash hider.

What rifles does the LS-5 fit? It is a 5.56mm rifle suppressor for barrels with the standard 1/2×28 muzzle thread.

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 LS-5 Rifle 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. With the KFM flash hider included, any 5.56 barrel threaded 1/2×28 is ready for it. Order through Radical Defense‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.