LMT-AT Testing Standard (LATTS): Why & How We Test At LMT-AT, our commitment to performance begins with strict military-grade testing procedures from product inception to the final production model. Every rifle, suppressor, and accessory we produce must meet standards that exceed conventional industry expectations. The rigorous US military or NATO testing standards used to test LMT products are designed to replicate the worst of battlefield conditions, ensuring reliability no matter the environment or mission. Why Suppressor Testing Standards Matter Suppressor testing standards exist to ensure that performance claims are measurable, repeatable, and defensible under real‑world operating conditions. Without standardized testing, suppressor performance is reduced to subjective marketing claims rather than validated data. Internal LMT‑AT identifies rigorous physical testing as a core differentiator—prioritizing real firing, environmental exposure, and durability validation over simulations or theoretical modeling alone. Standards matter for all shooters safety which is why our commercial products are tested, iterated, and produced under the same harsh testing standards performed for military, agency, or law enforcement customers. Standards Establish Credibility & Accountability Suppressors are subjected to extreme heat, pressure, cyclic loading, and gas dynamics. Formal testing standards provide an objective framework to validate durability, service life, accuracy retention, and gas system behavior. LMT‑AT testing philosophy emphasizes evaluating products to the highest applicable U.S. MIL or NATO standard, rather than unpublished or internally defined benchmarks, ensuring claims can be independently justified if required. Test Standards Enable Meaningful Comparison in a Crowded Market The commercial suppressor market often applies vague descriptors such as “full‑auto rated” or “duty‑use” without disclosing firing schedules or failure thresholds. Defined testing standards allow suppressors to be evaluated conservatively against known firing schedules, thermal limits, and wear cycles, creating meaningful comparison across manufacturers rather than confusion caused by inconsistent terminology and claims made under undocumented test conditions or no testing at all. Ultimately, suppressor testing standards distinguish validated performance from those unverified marketing claims. What Is the LMT-AT Testing Standard (LATTS)? Unlike basic quality checks used elsewhere, LMT-AT applies a layered and repeatable process, which we call the LMT-AT Testing Standard or LATTS for short, that validates durability, precision, and long-term performance. This includes high-round-count evaluations, environmental stress tests, sound/flash/heat/pressure analysis, and advanced accuracy verification. Together, these military-grade testing procedures allow us to deliver weapon systems that operators can trust in the harshest conditions. Our approach is built on decades of engineering experience and continuous collaboration with military and law-enforcement professionals. Each test sequence helps us refine our products and improve the user experience. For example, our suppressor testing includes among many tests—thermal performance, repeatable point-of-impact tracking, and sustained-fire endurance—standards rarely performed by commercial manufacturers. To maintain transparency and trust, we document every phase of our testing process. This ensures that dealers, MIL/LEO agencies, and individual customers understand how and why our equipment is validated. Unfortunately, not all the MIL or NATO standards we use are available to the public, however, we will lay out the standards that are publicly available & how we use them to ensure optimal product performance. These testing protocols support the LMT-AT mission: to provide uncompromising tools built for real-world use. Why We Test – The Mission Behind the Method Whether you are researching LMT rifles, comparing suppressor systems, or evaluating our manufacturing philosophy, knowing why and how we test is essential. While we are striving to have a set industry standard for rating a product as full auto rated, measuring mitigation of sound, flash, gas blowback and other performance characteristic tests; at this time there is no industry standard for any test. Our goal is to provide an “apples-to-apples” comparison for all users through a set industry standard or otherwise through highlighting the testing protocols we use to support our performance values for the respective test. Through rigorous methodology and continuous improvement, LMT-AT delivers equipment proven through true military-grade testing procedures—not assumptions. How We Test * LMT Advanced Technologies Testing Standards: – Full Auto Rating: US SOCOM Table II Stress Test Firing Schedule – Durability: TOP 3-2-045 & NATO AC225 D14 – Adverse Conditions: MIL-STD-810G Method 501.5, method 502.5 – Acoustic Muzzle Blast: MIL-STD-1474, NATO STANAG (AEP-4785 VOL I), TOP 3-2-045 – Accuracy: Dispersion & Point of Impact (POI) Shift—Suppressed to Unsuppressed Fire – Gas Blowback/Backpressure: Cyclic Rate/Rate of Fire & NATO STANAG (AEP-4785 VOL III) – Visual/Infrared Muzzle Flash: TOP 3-2-045 & NATO STANAG AEP-4785 VOL II) – Toxicity: NATO STANAG AC/225 D/14 – Thermal Response: NATO AEP-4785 (VOL IV) Full Auto Rating: US SOCOM Table II Stress Test & GoldenWebb Durability Standard US SOCOM Table II Stress Test This testing standard used by United States SOCM is a high-intensity durability protocol designed to ensure firearm suppressors can withstand extreme, sustained, and rapid full-automatic fire without failing or causing malfunction to the host weapon. * Test Equipment Used: – Test Weapon, Suppressor, Muzzle Device, Magazines (mounted to SOCOM SURG spec) – Operator Safety Barrier – Ballistic shield or remote firing enclosure for destructive testing – Infrared Camera – Thermocouples/Infrared Sensors – Data Logging System – Chronograph/Rate of Fire Monitor – Stopwatch/Timer – Cooling Station – Ambient Condition Sensors – Ballistic Containment Backstop – Inspection Tools – Digital Camera We understand that not every user needs or wants the detailed level of data provided through these military-grade testing standards. We also understand that because there is not a set standard for any testing in the suppressor industry that users will look to third party groups where testing is not done via NATO or US MIL standard but by the respective third-party standard for a comparison of products. This is why we have and will continue to work with various third-party groups to compare our products backed by our own internal testing, against other manufacturer’s products until an industry standard is agreed upon and set. A shining example of a third party we’ve partnered with specific to full-auto rating/durability being GoldenWebb. GoldenWebb Full-Auto Standard On his YouTube channel, you’ll find this self-described “2A Guntuber” testing the limits of a respective manufacturer’s product until failure-drastically increasing the firing cadence to a much more aggressive schedule compared to the varied rate of fire of the US military standard we use internally-the US SOCOM Stress Test Firing Schedule. See how the ION suppressor is able to handle the abuse over 750 rounds… * Test Equipment Used: – LMT ION 30 Suppressor System (Part number: ATION3) – LMT 14.5″ Chrome Lined 5.56×45 1:7″ RH Twist Rifle Barrel (Part number: R-L7NE1B) – LMT 13.25″ Monolithic Rail Platform (MRP) Quad Upper (Part number: R-L7RA1A) – LMT 5.56 Full-Auto Enhanced Bolt Carrier Group (Part number: R-L7Q3) – Lower Receiver – Supplied by Center Target Firearms and Indoor Range – Magazines – Supplied by GoldenWebb – Operator Safety Barrier – Supplied by GoldenWebb – Operator Safety Shield & Plate Carrier: Supplied by RTS Tactical – 5.56 Ammunition: Supplied by Optics Planet Durability: TOP 3-2-045 & NATO AC225 D14 Test Operations Procedure (TOP) 3-2-045: Standardized testing methods for U.S. Army developmental and operational testing for evaluating the reliability, safety, performance, and accuracy of small arms up to 50mm in caliber. Key tests include: – Performance: Rate of fire, accuracy (e.g., 100-meter testing), and environmental testing (e.g., extreme temperatures). – Safety & Function: Evaluation of safety features, cookoff, and reliability. – Physical Characteristics: Weight, center of gravity, length, and profile * Test Equipment Used: – Brookfield viscometer – Cyclic rate recorder – Maximum permissible error of measurement: +1% at rates up to 6000 spm & burst lengths of 100 rounds – Stargage and airgage – Maximum permissible error of measurement: +0.025 mm – Thermograph/thermocouples – Maximum permissible error of measurement: +0.6°C (1°F) – Velocimeter – Maximum permissible error of measurement: 0.1% or 0.5 m/s (whichever is highest) for bursts to 6000spm – Weapon, Suppressor, and Muzzle Device (installed per TOP 3-2-045 requirement) – Magazine and Ammunition (per TOP 3-2-045 spec) NATO AC225 D14 (Restricted): International/NATO standard which provides the specific procedures to evaluate if a weapon system can handle the rigorous demands of military combat conditions. Given a large amount of LMT’s customer base are international customers, LMT-AT tests its products durability according to the international NATO STANAG AC/225 D/14 or “D/14” test standard regimen. This ensures the LMT product is in compliance with those durability standards for international & domestic customers. We then continue to go beyond those performance requirements to push the products standards even further. This standard tests small arms including the performance of suppressors to assess if new weapon systems are suitable, safe, and reliable for service in NATO countries, focusing on technical and operational requirements. Adverse Conditions: MIL-STD-810G Method 501.5, Method 502.5 MIL-STD-810G Method 501.5, Method 502.5 U.S. Military technical standard that defines environmental stress test to ensure equipment durability against harsh conditions like extreme temperature (ranging from 71°C to -51°C / 159.8°F to -59.8°F), shock, salt fog, sand, dust, vibration, humidity, and freezing rain. * Test Equipment Used: – Environmental chambers/controllers (temperature, humidity, altitude / vacuum, combined environments) – Calibrated thermocouples/RTDs – Dew point sensors – Barometric sensors – Data loggers/DAQ with traceable calibration – Fixtures & mounts (nonreactive to test fluids) – Sealed enclosures – Drip pans – Isolation pads – Safety shielding – PPE appropriate to explosive/chemical atmospheres – SPL meters/microphones – Accelerometers/force transducers – Vibration & shock controllers – High-speed cameras (flash, shock, gunfire) – Flow meters – pH meters – Conductivity meters – Scale balances (for fallout rates) – Calibration artifacts and verification media (salt solutions, sands/dusts of specified composition/size) – Test Weapon, Suppressor, Muzzle Device, Magazines (mounted to MIL-STD-810 spec) Acoustic Muzzle Blast (Sound): MIL-STD-1474, NATO STANAG (AEP-4785 VOL 1), TOP 3-2-045 MIL-STD-1474 U.S. Department of Defense standard for design criteria that establishes maximum permissible noise limits for military systems, equipment, and facilities. It also specifies measurement procedures to promote personnel safety, speech intelligibility as well as security from acoustic detection & recognition. Requires impulse-capable peak and exposure measurement system tied to compliance thresholds. * Test Equipment Used: – Ballistic Test Fixtures (Rigid mounts for repeatable weapon positioning) – Type 1 Precision Sound Level Meter (ANSI S1.4 compliant, Class 1 accuracy) – Microphones (Free-field, ½-inch or ¼-inch condenser microphones with windshields) – Microphone Preamplifiers [Low-noise, compatible with high SPL (up to 190 dB for impulse tests)] – Data Acquisition System (Multi-channel recorder capable of high-speed sampling (≥100 kHz per channel) – Signal Conditioning Hardware (Filters and amplifiers for impulse noise analysis) – Calibration Equipment [Acoustic calibrator (pistonphone) for microphones] – Tripods & Positioning Fixtures [For precise placement at shooter’s ear and 1 m left of muzzle (per Appendix B)] – Weather Station or Sensors (temperature, humidity, barometric pressure, wind speed/direction) – Data Logger (For continuous environmental monitoring during tests) – High-Speed Data Recorder (For capturing SPL vs. time during bursts) – Trigger Synchronization System (Links weapon firing to data acquisition) – Blast Shields & Safety Barrier – Weapon, Suppressor, and Muzzle Device (installed per MIL-STD-1474E requirement) – Magazine and Ammunition (per NATO spec) – All instrumentation must be calibrated and traceable to NIST standards – Test setup must avoid reflective surfaces within 15 m for open-air measurements NATO STANAG (AEP-4785 VOL I) NATO standard to evaluate the acoustic performance of weapon suppressors. Requires waveform-accurate, high-fidelity recording systems capable of post-processing. Vol I (Acoustic Testing) is designed to ensure procedures for measuring the sound suppression capabilities of small arms suppressors are consistent & improve the quality of suppressor equipment used by NATO forces. Volume II-IV are not publicly consumable like volume I is for acoustic testing. * Test Equipment Used: – Ballistic Test Fixtures (Rigid mounts for repeatable weapon positioning) – Type 1 Precision Sound Level Meter (Class 1 accuracy) – Microphones (Free-field pressure microphones suitable for outdoor measurement, 1/3-octave band analysis) – Microphone Preamplifiers (Low-noise, wide-dynamic-range preamplifiers) – Data Acquisition System (Multi-channel recorder capable of recording raw pressure-time data) – Signal Conditioning Hardware (Very high dynamic range to preserve waveform integrity) – Calibration Equipment (Acoustic calibrators compatible with waveform system) – Tripods & Positioning Fixtures – Weather Station or Sensors (temperature, humidity, barometric pressure, wind speed/direction) – Data Logger (For continuous environmental monitoring during tests) – High-Speed Data Recorder – Trigger Synchronization System (Links weapon firing to data acquisition) – Blast Shields & Safety Barrier – Weapon, Suppressor, and Muzzle Device (installed per requirement) – Magazine and Ammunition (per spec) TOP 3-2-045 Test Operations Procedure (TOP) 3-2-045: Standardized testing methods for U.S. Army developmental and operational testing for evaluating the reliability, safety, performance, and accuracy of small arms up to 50mm in caliber. Within this compilation, acoustic and impulse‑noise measurements are used to support weapon performance, safety evaluations, and downstream health‑hazard assessments when applicable. Unlike NATO AEP‑4785, TOP 3‑2‑045 is not a dedicated acoustic‑signature standard; acoustics are one component within a broader weapon‑system evaluation framework. * Test Equipment Used: – Impulsive‑Noise‑Capable Sound Measurement System – High‑Pressure Impulse Microphones – Shock-Tolerant Microphone Preamplifiers and Signal Conditioning – High‑Speed Data Acquisition / Recorder [Ability to capture impulse peak & peak sound pressure level dBP)] – Acoustic Calibration Equipment – Protective Hardware – Analysis & Post‑Processing Software – Environmental Measurement Instruments (Supporting) – Ballistic Test Fixtures (Rigid mounts for repeatable weapon positioning) – Weapon, Suppressor, and Muzzle Device (installed per requirement) – Ammunition (per spec) Accuracy: Dispersion & Point of Impact (POI) Shift Dispersion Standard used determined if the suppressor has any influence on the respective weapon system’s native dispersion characteristics. A 20-round unsuppressed group is fired at 100 meters to first establish a baseline level of dispersion performance with the system ammunition to the suppressor’s mating muzzle device. Then the suppressor is fitted to the weapon and a 20-round suppressed group is fired. Finally, the suppressor is detached and reattached and a 20-round group is fired to establish repeatability of the mounting system. The barrel and suppressor are then forced-air cooled to ambient temperature between each group to remove the influence of compounding heat buildup in the system. * Test Equipment Used: – Ballistic Test Fixture for accuracy (Rigid mounts for repeatable weapon positioning) – Precision Targeting & Impact Measurement Systems – High-Speed Videography / Motion Capture Systems – Electronic Sensors & Strain Gauges (For dynamic load measurement) – Chronographs / Doppler Radar – Environmental Measurement Instruments – Data Acquisition and Analysis Software – Forced-Air Cooling System – Weapon, Suppressor, and Muzzle Device – Ammunition (per NATO spec) Point of Impact (POI) Shift—Unsuppressed to Suppressed Fire Standard used to quantify, document, and validate the magnitude, direction, and repeatability of impact displacement resulting from changes to the weapon system configuration. This test is used to evaluate suppressed vs. unsuppressed configurations, mounting repeatability, and system stability under controlled conditions. POI shift is treated as a measurable system characteristic, not a failure mode, provided the shift is consistent and repeatable. This test is accomplished concurrently with the dispersion test. The point of impact for the unsuppressed and each suppressed group is recorded and POI shift is calculated from the dispersion data set. The second suppressed dispersion group is compared to the first to establish the repeatability of the mounting system. * Test Equipment Used: – Ballistic Test Fixture for accuracy (Rigid mounts for repeatable weapon positioning) – Precision Targeting & Impact Measurement Systems – High-Speed Videography / Motion Capture Systems – Electronic Sensors & Strain Gauges (For dynamic load measurement) – Mounting Interface Verification Tools – Chronographs / Doppler Radar – Environmental Measurement Instruments – Data Acquisition and Analysis Software – Forced-Air Cooling System – Weapon, Suppressor, and Muzzle Device – Ammunition (per NATO spec, lot controlled) Gas Blowback / Backpressure: Cyclic Rate & & NATO STANAG (AEP-4785 VOL III) Cyclic Rate / Rate of Fire via High-Speed Video (HSV) Analysis Standard used to analyze, measure, and manage the increased pressure and operating speed that suppressors introduce to semi-automatic and automatic weapons. This testing ensures that suppressors do not cause catastrophic failure, excessive wear, or unacceptable reliability issues due to increased bolt velocity based upon backpressure or rate of fire increase. Cyclic rate is used as a correlation to the suppressor’s effect on carrier velocity and therefore system reliability. Ten rounds are fired in full-auto and the system’s cyclic rate is measured in rounds per minute (RPM) using a PACT timer. Allows visualization on how a suppressor increases bolt speed. Data is then used to determine how much, or how fast, a specific suppressor forces gas back into the action. * Test Equipment Used: – High-Speed Camera (Capable of ≥10,000 frames per second (fps) for small arms; higher fps for ultra-fast cycles) – Lens System (High-resolution optics with adjustable focal length for close-up bolt/charging handle view) – Lighting Setup (High-intensity LED or strobe lights to eliminate motion blur and ensure clear frame capture) – PACT Timer – Tripod or Rigid Mount (For stable camera positioning aligned with the weapon’s bolt carrier group) – Trigger Event Marker (Visual cue (LED flash) or acoustic signal synchronized with firing start) – Time Reference Overlay (Built-in timestamp or external timing generator for frame-to-time correlation) – Motion Analysis Software: Used to measure bolt travel distance per frame and compute velocity/cyclic rate – Test Weapon, Suppressor, Muzzle Device, Magazines, Ammunition NATO STANAG (AEP-4785 VOL III) – Restricted (Commercially Restricted) Standard used to quantify the combustion products that escape from the weapon’s action (ejection port/charging handle) back towards the operator. The method focuses on assessing the health risk to the shooter from toxic gases and particulate matter, consumed by the operator through felt backpressure particularly in confined spaces. Procedure measures aerosolized metals (e.g., copper, zinc, bismuth) in the blowback gas. One methodology uses air sampling inlets which are placed in positions corresponding to the shooter’s face to measure the concentration of gases that reach the operator while another methodology measures captured gas over a set period within a specified area. Visual/Infrared Muzzle Flash: TOP 3-2-045 & NATO STANAG AEP-4785 (Vol II) TOP 3-2-045 Test Operations Procedure (TOP) 3-2-045: Standardized testing methods for U.S. Army developmental and operational testing for evaluating the reliability, safety, performance, and accuracy of small arms up to 50mm in caliber. Within this compilation, use of a wide range of measurements are used to support weapon performance, safety evaluations, and downstream health‑hazard assessments when applicable. Unlike NATO AEP‑4785, TOP 3‑2‑045 is not a dedicated muzzle flash‑signature standard; flash is one component within a broader weapon‑system evaluation framework. – Low‑Light / Night‑Capable Optical Imaging Devices – Calibrated Optical Picture & Recording Equipment – Controlled Low‑Light Test Environment – Data Logging & Test Documentation Tools – Environmental Measurement Instruments (Supporting) – Ballistic Test Fixtures (Rigid mounts for repeatable weapon positioning) – Weapon, Suppressor, and Muzzle Device (installed per requirement) – Ammunition (per spec) (Restricted) NATO STANAG AEP-4785 (Vol II) This (restricted) standard is part of a broader set of, STANREC 4785 (Test Procedures for Small Arms Suppressors), which establishes recommended practices for evaluating suppressor performance. Volume II defines the standard, test procedures, and data presentation for flash intensity measurements in the visible and infrared spectrum for small arms suppressors. Vol II specifically addresses the measurement of light signatures in both the visible and infrared spectrums. Thermal Response: NATO STANAG AEP-4785 (Vol IV) (Restricted) NATO STANAG AEP-4785 (VOL IV) As mentioned above for Vol II of the (restricted) NATO test STANAG AEP-4785 (Vol IV) standard is part of a broader set of, STANREC 4785 (Test Procedures for Small Arms Suppressors), which establishes recommended practices for evaluating suppressor performance. Volume IV focuses on the measurement of the thermal signature of suppressors as it directly affects signature management or detection by thermal optics. Restricted Test Standards, Not Publicly Consumable: Durability: NATO STANAG AC/225 D/14 Visual / Infrared Flash: NATO STANAG AEP-4785 (VOL II) Gas Blowback/Backpressure: NATO STANAG AEP-4785 (VOL III) Thermal Response: NATO STANAG AEP-4785 (VOL IV) Toxicity: NATO STANAG AC/225 D/14 Third Party Test Standards Performed on LMT-AT Products: – Full Auto Rating: GoldenWebb + LMT ION 30 Suppressor Meltdown – Acoustic Muzzle Blast: PEW Science + ION LT — Suppressor Sound Signature Reviews — PEW Science – Gas Blowback/Backpressure: PEW Science + ION LT — Suppressor Sound Signature Reviews — PEW Science
