You want an OPS-CORE-style Helmet but in a budget and already have a helmet? No need to worry since you can purchase the Accessory Rail Connector (ARC) replica at Airsoft Park. You can get the full set for US$19.99, shipping costs included. You can install the rails on MICH or IBH helmets, as long as you're up to doing some DIY. Great for mounting accessories such as helmet cams and torches with rail adapters.