Earmor M11 ARC Helmet Rail Adapter for 3M Peltor
Earmor M11 ARC Helmet Rail Adapter for 3M Peltor
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DETAILS
DETAILS
- description
Rail adapters look interchangeable and are not. The clamp that grips the helmet rail is common across brands, but the yoke that receives the earcup is cut to a specific pattern, and a Peltor cup will not sit in an Earmor-pattern yoke. Buying the wrong one is the commonest mistake in this corner of the catalogue.
This version carries the Peltor cut and is listed for 3M Peltor Comtac headsets and their replicas. It fits helmets with ARC rails, which covers Ops-Core FAST, ACH and MICH shells and the overwhelming majority of what turns up on a UK site.
It ships as a pair, which sounds obvious until you have bought a single-side mount from somewhere else.
Worth knowing: this part carries an Earmor part code and an Earmor barcode, but it does not appear in Earmor's 2026 catalogue and has no page on their website. It is a real Earmor product sold through their own distribution rather than a catalogue line, which is why published detail on it is thin.
Specifications
| Specification | Detail |
|---|---|
| Type | ARC helmet rail adapter, 3M Peltor pattern |
| Headset compatibility | 3M Peltor Comtac headsets and replicas |
| Helmet compatibility | Ops-Core FAST, ACH and MICH, and helmets with ARC rails |
| Supplied as | A pair |
| Weight | 75 g (retailer-stated; Earmor publish none) |
| Manufacturer part number | M11-PELTOR |
| Brand | Earmor |
Frequently asked questions
How do I tell Peltor from Earmor cups? Look at the boss where the headband arm enters the cup. The two use different profiles. If in doubt, photograph it and send it to us before ordering.
Can I use it with Earmor cups instead? Use the standard M11 for Earmor cups. They are not interchangeable in either direction.
Does it work on M-LOK helmet rails? No. M-LOK is a different rail standard — the M13 for 3M Peltor covers that case.
Why is so little published about it? Because Earmor do not catalogue it. We have given you everything that is published and flagged the gaps rather than filling them in.