I own two sets of the Mark headset mounts. I own a lot of Unity Tactical products. The cost is very reasonable, and I have never had an issue with the quality of their products over the years.*One quick note – Someone mentioned these have two longer screws and two shorter screws, and they should have four longer screws. According to UT, this is not correct. The shorter screws secure the mount to the rail adapter (use one short screw on the left side of the helmet and one short screw on the right side of the helmet). The longer screw should be lined up with one of the slots in the ARC rail (one longer screw on the left side of the helmet and one longer screw on the right side of the helmet). This will prevent the mount from coming loose and moving/sliding in the ARC rail.