The LMT-AT ION K 5.56 in Armorer Black is the smallest and most compact model in the LMT Advanced Technologies ION suppressor series (LMT-AT part no. ATIONK). It is built for shooters who want to limit the length and weight a can adds to a 5.56 rifle while keeping the modular ION design. A pre-installed 5.56mm 3-prong flash hider cap and a 1/2×28 single port muzzle mount come in the kit, so it goes onto a standard 5.56 barrel without extra parts. The laser-welded hybrid nickel and steel body is full-auto rated, and the removable base and cap make it user-serviceable. It suits carbines and short builds where handling matters as much as suppression.

Key Specifications

• The caliber rating is 5.56, sizing the can for 5.56 rifles and carbines.
• Length is 5.76 inches with cap and base, and 4.63 inches for the welded body alone.
• Weight is 15.7 ounces with cap and base, and 12.7 ounces for the welded body alone.
• Diameter is 1.74 inches, a slim tube that clears most handguards and optics.
• Construction is a hybrid of high-temperature nickel and steel alloys with a laser-welded body.
• The kit includes a 1/2×28 single port muzzle mount, a pre-installed regulator mount adaptor and a pre-installed 5.56mm 3-prong flash hider cap.
• The finish is Cerakote Armorer Black, with a PVD-treated end cap and a DLC-coated muzzle device.

Frequently Asked Questions

What comes with the ION K? LMT-AT lists the suppressor, a pre-installed regulator mount adaptor, a pre-installed 5.56mm 3-prong flash hider cap, a 1/2×28 single port muzzle mount, an ION tool, stickers and the operator manual.

Is the ION K full-auto rated, and are there barrel length limits? LMT-AT lists it as full-auto rated under the SOCOM stress test protocol of 1,440 rounds, with a service life of 30,000+ rounds, and lists no barrel length restrictions.

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 LMT-AT ION K 5.56 Compact Suppressor, Armorer Black, 1/2×28

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 LMT-AT‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.