The patented Accucam QD Mounting System is still the only QD Lever System available that does not add height to the EOTech optic. That's because this unique and innovative quick detach system retrofits directly to the body of the XPS. The Accucam QD Locking Lever System for The XPS replaces the EOTech socket head screw or thumbnut attachment method. No other modifications are required. The Accucam system installs in approximately ten minutes. The only tools required are a 7/64" allen wrench and a torx head wrench which are both included in the kit. Weighing only two ounces, it is fully adjustable to fit Weaver and MIL-STD-1913 dovetails.