American Technologies Network Corp ATN TICO series are thermal clip-ons that turn a daytime scope into a thermal imaging device in a matter of seconds.

There is no shift of impact, no need to re-zero or change of eye relief. Every individual ATN TICO Series is tested and aligned to the highest tolerances for perfect alignment every time it’s attached. Meanwhile, the ATN TICO Series is lightweight enough not affect the balance of the firearm, yet built rugged to withstand a variety of severe operating conditions. Made from aircraft-grade aluminum 6061 T6
with a hard-anodized coating to prevent corrosion and abrasion. A quick-release MIL-STD 1913 Picatinny mount allows for immediate attachment and detachment.

See more at http://www.atncorp.com/.