LMT ION 556-K Suppressor

ships to your FFL/SOT after ATF approval. Plan on 3 to 4 weeks.

LMT ION 556-K Suppressor


A battle proven, commercially ready suppressor from LMT Advanced Technologies.

LMT Defense, renowned for its legacy in crafting battle-ready rifles, is now extending its expertise into the realm of suppressors with the introduction of the ION 556-K. The suppressor is one of the first designs from the recently formed LMT R&D division, known as LMT Advanced Technologies.  While this is one of the first commercial offerings, AT has been busy developing processes and testing materials for LMT Defense, and we expect to see more products for the tactical communtiy from LMT-AT.

This dedicated 5.56 caliber suppressor enters a competitive market with a clear focus: to bring the battle-tested durability and precision that LMT is known for to the forefront of sound suppression technology. The ION 556-K is not just an addition to LMT's product line; it's a reflection of the brand's commitment to meeting the evolving needs of modern weapon handlers with reliability and ingenuity.

While the market for suppressors is indeed crowded, the ION 556-K distinguishes itself through its inherent LMT DNA—integrating modular configuration, effective sound reduction, and advanced baffle designs that collectively aim to optimize weapon performance and user experience. It stands as a testament to LMT's understanding of the rigorous demands of the field, combining commercial ease-of-use features like standard base thread and replaceable end caps with the resilience required for military operations worldwide. Designed and manufactured in-house, the ION 556-K is more than a suppressor; it's a strategic addition to any weapon system, ready to face the challenges of diverse missions and environments.

Features and Benefits

  • Optimal Noise Reduction: Engineered for significant sound suppression, ensuring a stealthier and more focused shooting session.
  • Enhanced Durability: Constructed with stainless steel, steel alloy, and Inconel, this suppressor is designed to withstand intense conditions and provide longevity.
  • Configurability: The non-stagnate baffle design allows for customization, making it adaptable to various shooting requirements.
  • Multiple Mounting Options: Offers versatility in mounting, providing ease of use and flexibility for different firearms.
  • Minimal Backpressure: Crafted to ensure near-zero backpressure, enhancing the shooting experience and firearm longevity.

Like all things LMT, the design of the ION family of suppressors is not exterior lines, but deep internals that are engineered for performance.  The ION 556-K's balances sound reduction, durability, agility, manuervability and backpressure reduction.

The suppressor doesn't just mute the sound but significantly reduces the shooter's ear decibel exposure to below 140, a fact often underemphasized but vital for shooter safety and operational stealth.

The Non-Stagnate Baffle Design, a less discussed yet innovative feature, is pivotal in managing gas flow. This design ensures that the suppressor doesn't just silence the shot but also maintains the firearm's integrity and shooter's comfort by minimizing recoil and muzzle rise, as well as gas back into the operator's face. The result is an enhancement in accuracy and control, aspects that shooters deeply value.

Material choice in the construction of the ION 556-K is a conscious decision aimed at balancing durability and performance. The amalgamation of stainless steel, steel alloy, and Inconel is not random but a strategic selection to withstand high-pressure situations, as corroborated by extensive full-auto firing tests based on US DOD standards. This material integrity ensures that the suppressor is not just an accessory but a reliable component in every operation.

In the realm of tactical shooting, adaptability is key. The suppressor's multiple mounting options demonstrate an understanding of varied operational needs. Whether it's the use of the Regulator muzzle device or the flexibility to install directly onto the barrel, the ION 556-K adapts seamlessly, a feature often overlooked but highly appreciated by tactical professionals.

Environmental signature mitigation, another subtle yet critical feature, underscores the suppressor's tactical advantage. By minimizing flash and other environmental impacts, it ensures the shooter's position remains concealed, a tactical nuance that can define the success of an operation.

While the ION 556-K's noise reduction capabilities are widely recognized, its contribution to maintaining the firearm's longevity through minimal backpressure is a less talked about yet significant feature. The suppressor's design ensures that the firearm's internal components are not subjected to excessive stress, thereby enhancing the weapon's lifespan – a fact that resonates well with tactical professionals who value not just performance but also the longevity of their equipment.

Product Design and Features

  • Material Excellence: The suppressor boasts a construction of stainless steel, steel alloy, and Inconel, ensuring robustness and resistance to extreme conditions.
  • Coating Precision: The body is coated with Cerakote Armorer Black C-192, while the removable cap and base receive treatment with UltraOx, promising durability and corrosion resistance.
  • Laser Welded Construction: Ensures structural integrity and precision, offering a seamless and robust build.
  • Flash and Environmental Signature Mitigation: Designed to not only suppress sound but also to minimize flash and environmental impact during firing.
  • Full Auto Firing Endurance: Tested rigorously to endure multiple cycles of full-auto firing, adhering to stringent US Government test standards.

At the heart of the ION 556-K's brilliance is its modular configuration, a product of testing and testing and retesting in the Advanced Technologies labs.  The suppressor's design enables a tailored shooting experience, allowing operators to fine-tune its configuration to suit varying operational needs. This level of customization is pivotal, especially in high-stakes scenarios where every detail can tip the scales between success and failure.

Sound suppression with the ION 556-K isn't just about noise reduction; it's about crafting an environment where stealth meets precision. The suppressor's advanced baffle designs play a critical role in reducing gas blowback and mitigating the stress exerted on the weapon system, ensuring that every shot is not just silent but also smooth and accurate.

LMT has seamlessly integrated commercial features into the ION 556-K, such as the industry-standard base thread and replaceable end caps. These features are complemented by a robust construction designed to withstand the rigorous demands of military forces worldwide. The suppressor's endurance is not just a claim; it's a proven fact, having been designed to surpass the grueling US SOCOM endurance testing schedule.

Drawing inspiration from the core style of LMT's renowned belt-fed suppressors, the ION 556-K is a manifestation of durability and performance. It's more than just a suppressor; it's a strategic asset, meticulously engineered to enhance your operational capability and redefine the standards of environmental sound suppression. Whether you're embarking on a covert mission or navigating the complexities of a tactical operation, the ION 556-K stands as the ultimate companion for your next endeavor.

Comparative Analysis and Third-Party Insights

When compared to its counterparts in the market, the ION 556-K stands out not just for its noise suppression but for its comprehensive approach to tactical needs. As one user on noted, "The ION 556-K's ability to maintain accuracy and reduce muzzle rise is unmatched, making it an indispensable tool for any serious shooter."

Furthermore, reviews from highlight the suppressor's robust construction and material choice, with users often emphasizing its longevity and reliability under rigorous use, a testament to LMT Defense's commitment to quality.

Technical Specifications

Material Composition Stainless Steel, Steel Alloy, Inconel
Coating Cerakote Armorer Black C-192, UltraOx (cap and base)
Construction Laser Welded
Sound Reduction Sub 139.9 at Shooter’s Ear
Mounting Options Multiple; includes Regulator muzzle device, 1/2 x 28” Regulator Direct Thread Adaptor
Customization Configurable Non-Stagnate Baffle Design, Titanium accessories available
Full Auto Rated Yes
Optimized for Accuracy Yes
Weight 19 oz (with stainless steel cap and 4140-steel alloy base)
Length 7.14"
Flash and Environmental Signature Mitigation    Yes

More about the Configurability of the ION-556K

The LMT ION 556-K Suppressor's baffle design is a standout feature, not only for its performance in noise and signature reduction but also for its configurability. The Non-Stagnate Baffle Design is a modular system that allows shooters to tailor the suppressor to their specific needs, a flexibility that's especially valued in tactical and precision shooting scenarios.

Configurability of the Baffle Design:

  1. Modular Construction: The baffles are constructed in a way that allows for easy disassembly and reconfiguration. This modular design means that shooters can adjust the internal setup of the suppressor based on their specific requirements, be it for different calibers or shooting environments.

  2. Caliber Adaptability: One of the most significant aspects of the ION 556-K's configurability is its ability to adapt to various calibers. This is made possible through the interchangeable baffle system, which can be customized to optimize performance for a specific caliber, enhancing the suppressor's versatility across different firearms.

  3. Environmental Signature Management: The baffle design is not just about noise suppression; it's also about managing the environmental signature. Shooters can configure the baffles to minimize muzzle flash and dust kick-up, crucial factors in maintaining concealment in tactical situations.

  4. Backpressure Regulation: The configurable baffle system also allows for the management of backpressure. By adjusting the baffle configuration, shooters can balance sound suppression with the minimization of backpressure, ensuring the firearm's optimal performance and longevity.

  5. Maintenance and Cleaning: The suppressor's design allows for easy disassembly, making maintenance and cleaning more straightforward. This feature ensures that shooters can keep the suppressor in top condition, maintaining its performance and durability over time.

  6. Material Selection for Baffles: While the primary materials used in the suppressor's construction are stainless steel, steel alloy, and Inconel, the configurable baffle design allows for the incorporation of other materials, like titanium, to meet specific needs such as weight reduction or corrosion resistance.

The configurability of the ION 556-K's baffle design represents a blend of performance, versatility, and user-focused innovation. It's a feature that underscores the suppressor's role as a sophisticated tool in the tactical shooter's arsenal, offering customization options that can significantly impact the shooting experience. By providing the ability to tailor the suppressor to individual preferences and operational requirements, LMT Defense ensures that the ION 556-K is not just a piece of equipment but a strategic asset in the field.


  • Use with Regulator muzzle device
  • Install directly onto the barrel using the 1/2 x 28” Regulator Direct Thread Adaptor
  • Use preferred mounting device

In the Box

  • ION 556k
  • Regulator SP Muzzle Mount 1/2×28″ 5.56
  • Restrictor Cap 5.56
  • ION Tool

Buying and shipping through Charlie’s is easy, but there is some information you need to know. This item must ship to FFL holder. No civilian exceptions.

       1)  Check your state laws to make sure the federally regulated item you want to purchase is legal in your state.

       2)  Find your FFL… Have your dealer send us a copy of their FFL and SOT to Charlie’s (Make them earn their fee!). Not every FFL is a SOT or Class 2 / Class 3 dealer.  

       3)  Be patient! You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.

That’s it! We try to make this process as simple as possible for our customers. Please click the “Buying a Firearm” tab at the top of this page for more information.


THIS IS A SERIALIZED ITEM.  It must ship to a Federal Firearms License holder.  No civilian exceptions.

Buying and shipping through Charlie’s is easy, but there is some information you need to know. Only a federally licensed firearms dealer may receive a firearm or federally regulated serialized item (like a receiver or suppressor). We cannot ship these items directly to you. Please follow these steps to process your transaction:

1)     Check your state laws to make sure the federally regulated item you want to purchase is legal in your state. Your FFL dealer should be able to give you all of the necessary information regarding your state specific laws. But, if we ship to your FFL, and there is a legal issue, we cannot accept a return. So please make sure that you know and follow your local and state laws.


2)     A quick google search will show you what Federal Firearms Licensed (FFL) dealers are in your area. When you are ready to purchase, contact the FFL dealer you would like to use and get their shipping address. During the check-out, put YOUR address in the “billing” section and the FFL DEALER’S address in the “shipping” section. If you don’t know your FFLs address, that’s okay. You can send the information later.


3)     After check out, make sure to contact your FFL dealer to ensure they will receive your shipment for you (most do this for a small fee, but you should always double check).


4)     Have your dealer send us a copy of their FFL to Charlie’s does not reach to your FFL (MAKE THEM EARN THEIR FEE!!!)


5)     Be patient! In order to ensure we remain compliant with all federal laws, our compliance department is kept separate from our sales and operations team. Please allow a few days for our compliance officer to verify all of your dealer’s documents and ensure all federal laws are being observed. You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.


That’s it! We try to make this process as simple as possible for our customers, but if you are unfamiliar the process or have any other questions, please visit our How to Buy a Suppressor page for more details.