BARSKA 6-24x50 IR AO Excavator Target Dot Riflescope
http://www.amazon.com/gp/product/B001JJCHHU?tag=sukses2015-20
6-24x variable magnification with large 50mm objective lens in a 100 waterproof and fogproof extra rigid shockproof construction
Multi-coated optics with illuminated target dot reticles
Adjustable objective lens is built with a adjustable mechanism
1 inch tube construction with fast focus eyebell
Bonus accessories includes set of 58 inch high ring sun-shade and flip-up covers
That allows for parallax correction for specific ranges starting form 20-25 yards to infinity