Those with existing COmtac I or II Headsets and an OPS-CORE Type of Helmet Rail, this FMA Adaptor set to mount the unit(s) to the helmet. You will need to remove the ear muffs before attaching it to the adapters as shown in a howto video below. The adapter set costs US$19.90 at EB Airsoft, shipping costs included, and you get a cool looking head gear.
This is a nice add-on protection to your helmet as it provides more cover for your ears. This FMA Side Cover for Helmet Rail will need the helmet rail system for it to be installed. It will fit real or replica OPS-CORE systems and it's made of runner and light enough not to add more weight to your helmet. It costs US$13.58 at EB Airsoft, and as always, shipping cost included in the price.
If you're looking for a helmet with rail and NVG mounts so you can put helmet cams, taclights, or even dummy NVGs, you can check these FMA fast helmets at EB Airsoft and the prices have been slashed from the original US$59.99 to US$56.59. These are available in red, dark earth, and black colours. As always, free shipping is already included in the price.