SNIPER&reg; RED GREEN DOT RD30 WITH FLIP-OPEN LENS COVER Constructed with single piece of premium Aircraft-grade aluminum with 30mm tube diameter body Nitrogen filled scope body, completely sealed with o-ring, making scope shockproof, waterproof, and fog proof Instant Lock on Target Quick Aim with side wheel dual red/green dot Great Field of View and unlimited eye relief Includes flip up lens caps and Picatinny scope ring mount