The Cage Airsoft annoounce the availability of the C-Tech Next Gen Recoil Connector at their online store... "The C-TECH Next Gen Recoil Connector is the only aftermarket replacement for a weak link in the Recoil Shock system. Compatible with the Tokyo Marui Next Gen M4 and HK416 series, it is CNC machined from 6061 aluminium and anodised for increased strength and corrosion resistance."