We are the manufacturer of the US Marine Scout Sniper Periscope Kit. NSN 1240-01-571-5004. This product is fully authorized for the US Military and all NATO countries. We have shipped over 5,000 periscopes that are in use worldwide, the product holds US and International Patents. Call 949-830-4300 or email micro-times@cox.net. Our company is Veteran owned. (less)