Eyes See Green Better. The RFX 11 is the next in a long line of purpose-built high quality and highly visible aiming devices from Viridian. Its tiny size is at home on any optics-cut concealed carry pistol or as a close-range offset sight on your rifle. At a mere 0.44 ounces the RFX 11 is one of the lightest reflex sights on the market. Packed with features including a highly visible and efficient Viridian green 3 MOA dot INSTANT-ON and auto shut off ambient light sensor and over 30k hours of run time make the RFX 11 a must have for any firearm.