This fits your . Make sure this fits by entering your model number. Upgraded headset adapters can match with a full range of FAST helmets (BJ, PJ , MH), ACH helmet, MICH helmet , IBH helmet, as long as they have ARC rails on side. Fully adapted to 19-21MM helmet rails Compatible with Earmor Tactical Noise Cancelling Headphones A single point gimbal attachment to the ear cups allow for 360˚ adjustment, which not only allows for better fitment and seal to the user's unique ear / head shape, but maintains that seal and moves more naturally with their head movement. The helmet connection arm can be retracted and shortened, allowing the user to adjust to a comfortable position when wearing the headset The helmet adapter arm has a large adjustment range. When the headset is not in use, it can be folded outward to fully dissipate heat from the ear, or it can be folded to the back of the helmet for storage.