Meprolight's Mepro GLS (Grenade Launcher Sight) was designed to solve the accuracy issues that have historically plagued grenade launcher optics. The Mepro GLS can be adjusted for elevation and features an integrated compensating system which takes into account projectile spin drift and corrects it. The long eye relief enables operators to acquire targets with both eyes open, improving accuracy and hit probability even further. Using the Mepro GLS is easy, just place the reticle on the target and shoot. An innovative dual self-illuminated internal power system allows the Mepro GLS to operate continuously for years without the need for batteries or an external power source, and accommodates use day or night and in any weather condition. Additionally, the Mepro GLS is available with various mounting hardware for use on side or top rails. Features of the Mepro GLS: Adjustable for elevation and compensates for projectile spin driftLong eye relief for use with both eyes open Dual self-illuminated internal power systemAvailable with various mounting hardware Meprolight USA Meprolight GLS 400M GLS Self-Illuminated Reflex Sight for 40mm Grenade Launcher w/Side Mount 623340