GUARDIAN(TM)OPTIC MOUNT & GUARD The GUARDIAN is the strongest optic mounting system on the market. TRU-SEAL(TM) eliminates the need for an added sealing plate. 0-rings on the mounting screws hold the plate watertight to the slide, sealing out moisture, eliminating corrosion in the mounting threads. Our STUD-LOK(TM) threaded stud/nut mounting interface is the most secure system on the market. This provides much longer thread engagement, greater hold down power, with increased shear resistance. SIX(TM) BACK-UP SIGHTS SIX(TM) back-up sights (BUS) seamlessly integrate into the Guardian Optic Mounting System providing rapid, reliable, and precise target acquis Mfg: Radian Weapons