**We only have the Full kits, which come complete with OEM Ops-Core AMP(TM) Cradle Clamp assemblies and are ready to rapidly attach to headsets out of the box** The Modular Attached Rail Kit (MARK) 2.0 allows the end user to seamlessly integrate their hearing protection and/or integrated communications into their headborne systems and improve the consistent seal of ear protection. The MARK 2.0 is compatible with most major helmet types and the most popular electronic hearing protection. The MARK 2.0 Tactical Helmet Headset Adapter Kit comes with all hardware for attachment to Ops-Core ARC(TM) (and similar) and Team Wendy EXFIL(TM) Gen 2 and 3 rails. An M-LOK(TM) Adapter Kit is sold separately for compatibility with MTEK and Hard Head Veterans brand helmets. The wider ARC(TM) backers allow for more compatibility with non-standard ARC-type rails than the previous model. MARK 2.0 is the lowest profile headset helmet mount on the market. Rather than using a traditional pop-in/pop-out mechanism, MARK2.0 is simply pulled away from the ears and rotated backwards for stowage. The aggressive wire forms ensure the strongest ear cup seal when engaged. Constructed of impact-resistant polymer, the MARK 2.0 Tactical Helmet Headset Adapter is designed for use in the most austere environments. This variant of the MARK 2.0 Tactical Helmet Headset Adapter is designed to work exclusively with the Ops-Core AMP(TM) headset. It is available in two configurations. Full kits come complete with OEM Ops-Core AMP(TM) Cradle Clamp assemblies and are ready to rapidly attach to headsets out of the box. The MARK Only kit does not come with the OEM Cradle Clamp assembly and relies on end-users to supply their own Ops-Core AMP(TM) Cradle Clamps. PLEASE NOTE: The wire forms for the AMP(TM) version are different than the legacy wire forms. Legacy MARK 2.0 wire forms are incompatible with the AMP(TM) Cradle Clamps due to length and crimp direction. The MARK 2.0 AMP(TM) offers another option for mounting the popular Ops-Core AMP(TM) headset to helmets. It attaches at the traditional 12 o'clock position and allows for broader helmet acceptance of AMP(TM) headsets. The OEM helmet mount attaches from the rear of the rail. If a helmet does not have a rear rail, the MARK 2.0 AMP(TM) will still allow users to attach to helmets.