The Timber Creek Greyman AMBI SS is a drop in replacement for the OEM safety selector on any Mil-Spec lower receiver. The modular aircraft grade aluminum levers, combined with the ability to choose either 90ø or 45ø short throw, allows the user multiple configurations to fit their specific shooting style. Includes all parts and hardware needed for installation. ***Always make sure your firearm is unloaded and the chamber is empty.*** While this product will function properly with most aftermarket triggers few may not be compatible.***Always complete a thorough function check after installing a safety or trigger assembly.***