Tactical FAST, ACH, MICH helmet ARC rail military adapter sordin bracket is suitable for MSA SORDIN series tactical headset
https://www.vogueparade.com/shopping/EN/200004310/1/1005001632364216/tactical-fast-ach-mich-helmet-arc-rail-military-adapter-sordin-bracket-is-suitable-for-msa-sordin-series-tactical-headset//