Supported by ACT in Black.
You can wear active ear pro underneath your helmet pads. Or you mount it directly to the helmet. Both methods have got their advantages and disadvantages.
If you want to mount your ear pro with proper pressure to your helmet, the MARK Adapter by Unity Tactical is a reliable solution. The shown model is compatible to ARC Rails.
Here the Adapter is combined with the SARA Sordin Adapters, that can be bought seperately.
This adapter is easy to mount. For this you need inch hexagon bits. Not the metric ones! Or you replace them.
This set is made up of several parts. Here you can see the ARC Rail Adapter disassembled. Here you can see, how the wire sits in the adapter.