Buy from Amazon.com : http://fave.co/1Gct4rC

ATN PS28 Gen 2 Day/Night Clip-On Night Vision Scope

Product Description :
Easily changes daytime scope to Night Vision Mounts in front of the daytime scope no re-zeroing required
Fast catadioptric front lens system
Comes with Quick Release Mount
Optional Scope Mounting System for coupling to the objective of the day scope 42587 mm diameter
No Export Outside of the United States of America ITAR Controlled Item