EARMOR M31 Review: The Plus Tactical Headset at NRR 22

Electronic Hearing Protection That Actually Lets You Hear

Published June 19, 2026 · Last updated July 27, 2026

Earmor M31 Electronic Ear Muffs Review (2026)

The Earmor M31 sits at a practical crossroads: it is a purpose-built electronic ear muff rated NRR 22 dB per ANSI S3.19, designed to let shooters and hunters maintain situational awareness without sacrificing hearing conservation compliance. Unlike passive muffs that block all sound indiscriminately, the M31 uses external microphones and internal speakers to amplify ambient sounds up to approximately 5X — capped at 82 dB output — while automatically compressing impulse noise (gunshots, impacts) before it reaches the ear. The result is a headset that lets you hear a range officer, a conversation partner, or a bird flushing from cover, and then silences the shot in the same breath.

At its listed price, the M31 is priced competitively against established names like the Howard Leight Impact Sport and the 3M Peltor Sport Tactical 100, both of which share the NRR 22 rating. What differentiates the M31 is its gel ear cushions, a low-profile cup design intended to minimize stock interference for rifle shooters, and a connectorized design that allows integration with compatible communication systems. The M31 is manufactured by OPSMEN under the Earmor brand — a line that has gained traction in both the civilian shooting market and among military and law enforcement users internationally.

This review draws on the verified product specifications, ANSI S3.19 standard methodology, and OSHA 29 CFR 1910.95 compliance context. No manufacturer samples were accepted. All claims are limited to what the specifications support. For the full range of electronic options, see our Electronic Ear Muffs collection or our guide to the best hearing protection for shooting.

Who the Earmor M31 Is For

The Earmor M31 is purpose-matched for sport shooters and hunters who need to hear between shots. It suits recreational range sessions, competitive shooting disciplines (three-gun, USPSA, IDPA), and hunting scenarios where the ability to hear game movement or partner communication matters as much as protection. The connectorized design extends its utility to law enforcement and military shooters who may integrate ear protection with communication systems. Light industrial users in environments up to approximately 98 dBA TWA will find the NRR 22 adequate for OSHA compliance, though dedicated industrial models with higher NRR or longer battery life may be better suited for continuous 8-hour shift use.

Users who should look elsewhere: workers in environments exceeding 98 dBA TWA (consider high-NRR passive muffs or double protection), those requiring Bluetooth audio streaming (step up to the M32), and budget buyers who need basic passive attenuation without electronics (passive options in our hearing protection collection start considerably lower).

Where the Earmor M31 Excels

NRR 22 dB — Adequate for the Majority of Shooting Environments

The M31's ANSI S3.19 NRR 22 dB rating is the industry-standard benchmark for electronic shooting ear muffs. Under OSHA's derating methodology — (NRR - 7) ÷ 2 — the effective real-world attenuation is approximately 7.5 dB, placing the protected exposure threshold at roughly 97–98 dBA TWA. Indoor ranges typically measure 90–100 dBA ambient (not counting impulse peaks); outdoor ranges run lower. In either environment, NRR 22 provides compliant protection for most standard shooting sessions. NIOSH's more conservative 50% derating yields 11 dB effective attenuation — still adequate for range exposures. See our full NRR hearing protection guide for calculation details and worked examples.

5X Ambient Amplification with Automatic Impulse Suppression

The defining feature of any electronic ear muff is the quality of its amplification and suppression circuit. The M31's microphones capture ambient sound and relay it through internal speakers at up to 5X amplification — capped at approximately 82 dB output per standard electronic muff design. When an impulse event exceeds the detection threshold, the circuit suppresses the signal within milliseconds. The 82 dB output ceiling means that even at maximum amplification, the electronics cannot deliver harmful sound levels to the ear. Gunshot impulse noise (140–165 dB peak SPL at the muzzle) is compressed automatically without requiring shooter intervention. This allows continuous conversation between strings of fire — a practical advantage that passive muffs cannot replicate. For a broader look at electronic protection options, see our shooting hearing protection guide and the best hearing protection overview.

Gel Ear Cushions — Acoustic Seal and Comfort

Standard ear muff cushions are foam-filled PVC. The Earmor M31 uses gel-filled cushions, which conform more closely to facial contours and create a better acoustic seal — particularly for shooters who wear glasses, have facial hair, or experience discomfort from extended foam-cushion pressure. A better acoustic seal is not cosmetic; compromised seal is one of the primary real-world failure modes for earmuff attenuation. An NRR 22 muff with a good seal outperforms a higher-rated muff with a broken seal. Gel cushions also distribute clamping pressure more evenly across the ear, reducing hotspot fatigue during multi-hour range sessions. Browse other ear muffs with premium cushioning and compare within our shooting hearing protection collection.

Low-Profile Design for Rifle Shooters

Bulky ear muff cups interfere with cheek weld when mounting a rifle. The Earmor M31 employs a low-profile cup geometry that reduces the likelihood of the cup contacting the rifle stock during shouldering. This is a practical engineering decision for the primary use case — sport shooting — and distinguishes the M31 from larger industrial-grade muffs that prioritize NRR over form factor. Pistol and shotgun shooters will also benefit, as reduced bulk improves overall comfort during extended use without a rifle-stock constraint.

Passive Attenuation Backup When Batteries Fail

A frequently overlooked advantage of earmuffs over electronic earplugs: the physical cup and cushion provide passive NRR 22 attenuation regardless of battery state. If batteries die mid-session, the M31 continues to function as a conventional earmuff. You lose the amplification and impulse suppression, but you retain meaningful hearing protection — unlike some electronic earplug designs where dead batteries can reduce protection substantially. For OSHA-compliant industrial programs, this passive fallback is a practical reliability consideration. Learn more at our hearing conservation program guide.

Where the Earmor M31 Falls Short

NRR 22 Is the Floor for Electronic Muffs, Not the Ceiling

Every major electronic shooting muff — the Howard Leight Impact Sport, the 3M Peltor Sport Tactical 100 — clusters around NRR 22. It is the category standard. If your noise environment demands more attenuation (above 98 dBA TWA), electronic muffs at this tier will not achieve compliance on their own. Passive muffs reach NRR 31–33, and double protection — muffs over foam earplugs — adds approximately 5 dB to the higher-rated device per OSHA guidance. The M31 is not deficient; it is operating at the category standard. See all hearing protection options if you need higher attenuation.

No Bluetooth or Audio Input Without Upgrading to M32

The M31 is a microphone-amplifier system with no wireless audio connectivity. Users who want to stream music, connect to a phone, or receive push-to-talk radio audio through the ear muffs will need the M32 variant, which adds a 3.5mm NEXUS-compatible audio input. The M31's connectorized design allows integration with external comm systems, but the baseline model does not include Bluetooth. For shooters who simply want electronic protection without comms complexity, this is a non-issue. For those expecting Bluetooth, it is worth clarifying before purchase.

Gel Cushions Retain Heat

Gel cushions offer acoustic and comfort advantages, but gel retains body heat differently than foam. In warm weather or during physically active shooting disciplines (3-gun, tactical courses), gel cushions can become noticeably warmer than foam alternatives. This is a comfort consideration for summer outdoor use, not a safety concern — the acoustic performance and NRR are not affected by cushion temperature. Users in consistently hot climates may prefer foam-cushion alternatives available in the electronic ear muffs collection.

Limited Verified User Review History at This Retailer

At the time of this review, the Earmor M31 carries zero verified Judge.me reviews on the WC Safety product page. This does not reflect the broader Earmor M31 user base — the model is well-established in the shooting community and carries substantial Amazon review volume — but it does mean this review relies on manufacturer specifications and ANSI/OSHA standards context rather than aggregated buyer feedback. We cite only what the specifications support.

Competitor Comparison

All three muffs below share NRR 22 dB (ANSI S3.19) and serve the shooting hearing protection market. The comparison focuses on differentiating features at current list prices.

Prices current at time of review. Amazon prices fluctuate. All Amazon links are affiliate links (tag=wcsafetyhear-20).

Accessories and Compatibility

Electronic ear muffs pair well with a few accessories that extend their utility:

• Replacement gel cushions: Gel degrades with UV exposure and extended use. Earmor replacement cushions maintain the acoustic seal performance of the original.
• AAA batteries (rechargeable): Rechargeable AAA batteries reduce long-term operating cost; ensure they are fully charged before range sessions.
• Hard-shell storage case: Protects the electronics and cushions between uses and during transport.
• Double protection pairing: For high-noise environments above 98 dBA TWA, pair the M31 with foam earplugs for additional attenuation per OSHA's dual-protection guidance.

For alternatives in the in-ear electronic category, our best in-ear hearing protection for shooting guide covers electronic earplug options that eliminate the stock-interference issue entirely. All hearing protection options are cataloged in our full PPE collection.

OSHA and ANSI S3.19 Standards Context

The NRR (Noise Reduction Rating) on the Earmor M31 packaging is determined under ANSI S3.19, the American National Standard for the measurement of real-ear attenuation of hearing protectors. Under ANSI S3.19 test methodology, subjects fit protectors themselves in a controlled laboratory setting — the results are optimistic relative to real-world field use.

OSHA 29 CFR 1910.95, the Occupational Noise Exposure standard, requires employers to provide and enforce hearing protector use when employee TWA exposures exceed 85 dBA (the action level) or 90 dBA (the PEL). OSHA specifies its own derating formula to account for the gap between laboratory NRR and field performance:

Electronic muffs add a layer of complexity: the electronics are active during use, but the NRR is a passive measurement. When the amplification circuit is engaged, ambient sounds are relayed at up to the 82 dB cap — the user hears amplified ambient sound at a controlled safe level while the passive NRR 22 cup continues to attenuate impulse events that trigger the suppression circuit. The NRR remains the governing specification for OSHA compliance purposes. See our complete NRR guide and hearing conservation program guide for full compliance context.

Frequently Asked Questions — Earmor M31