The KGM Core-556 FDE is the flat dark earth version of KGM’s direct-thread suppressor for AR-15 and M4-style rifles, carbines and pistols (brand part no. CORE-556-DT-FDE). It is rated for .223 Rem and 5.56 NATO and built on the same performance goals as KGM’s R556A1 and R556A2, in a simplified, fully welded stainless steel package. At 4.75 inches long and 13 ounces, it sits among the short K-can designs. Internal geometry derived from KGM’s Rogue-Alpha family manages gas to cut over-gassing and flash. It is a dedicated can for training, duty and the shooter with several AR-style rifles.

Key Specifications

• The caliber rating is .223 Rem and 5.56 NATO, covering the AR-15 and M4 platform.
• Construction is hardened stainless steel, fully welded, for a long service life under heavy firing schedules.
• Length without a mount is 4.75 inches, a short K-can profile.
• Weight is 13 ounces, light for a stainless rifle can.
• Diameter is 1.75 inches, KGM’s standard rifle suppressor width.
• Attachment is 1/2×28 direct thread only, and KGM says no crush washers or shims are needed.
• The finish is FDE C-Series Cerakote, a heat-resistant coating.
• An integrated flash-hider end cap works with internal gas redirection to reduce flash.
• The bore is cut by wire-EDM, which KGM uses to hold alignment and concentricity.
• KGM applies an in-house gas-nitride treatment to harden the suppressor further.

Frequently Asked Questions

Do I need a crush washer to mount it? No. KGM specifies direct-thread mounting on 1/2×28 threads with no crush washers or shims.

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.

Is the FDE model built differently from the black one? No. KGM offers the Core-556 in black and FDE C-Series Cerakote; this part number is the FDE finish.

Buy the KGM Core-556 Suppressor, 5.56 NATO, Direct Thread, 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. Order through KGM Technologies‘s silencers and suppressors lineup and our Lubbock, Texas team will handle the transfer.