CMC Triggers Mil Spec Buffer Tube Kit, Fits AR-15, Anodized Finished, Black 83626 CMC Triggers in-house production also allows for greater flexibility and the ability to respond quickly to market demands. This" in turn" benefits their customers" who can depend on a reliable and consistent supply of high-quality Buffer Tube Kits. The design features precise drainage holes that remove water from the system in marine environments.