It's not a standard thread, it's a left hand thread same as the FAL. The flash hider is not standard NATO either as a result. AAC makes a FNC quick-detach flash hider for their M4-2000 suppressor but last I looked it wasn't listed on their website. You can get the same flash hiders for your AR and HK and be able to mount the suppressor on any of them. I'm currently awaiting transfer of an M4-2000 with FNC and AR-15 flash hider mounts as well as an Avenger suppressor for my Mini Uzi.