The hole you see in the well-used Nightforce 3.5-15×50 NXS scope at right was made by an enemy 7.62×39 round fired at a U.S. soldier. The bullet completely penetrated the erector tube – the heart of the scope’s optical system. We’re happy to report that the
soldier was not injured, and the only casualty is the scope’s magnification ring, frozen on 15x. Its focus, tracking, and all other functions work just fine. It holds point of aim like new. The soldier wrapped the scope in duct tape to keep out sand and dirt, and used it without a problem for the next
three days, completing his mission. We receive many stories like this. Because Nightforce riflescopes are used in active theatres by most of the elite special forces worldwide, they are subjected to – and survive – the most brutal conditions imaginable. We won’t say they’re bulletproof. There is at least one soldier, however, who would argue otherwise.

http://www.nightforceoptics.com/MILITARY___LE/military___le.html

I think I want to try me one of them Nightforce scopes. WOW!

Read original blog post