CISNO Tactical Pistol Gun Laser Sight Airsoft Pointer with Quick Release, Green Beam URABILITYMade of high grade aluminum construction, lightweight and durability; Fully adjustable settings for windage and elevation, works well in any weather conditions. Fits all Railed weapons weaver/picatinny; Some weapons may require an adapter like H&K and Sigma series pistols, some sig sauer pro series. Laser hazard Class: IIIa & Output Power:  5 mw TACTICAL GREEN LASER: Highly visible green laser with improved accuracy,With a Quick Detachable Weaver style mount, you can quickly install and remove the powerful green laser in seconds perfect for hunting. Power by 1x CR2 battery(included) and fully adjustable laser for Windage and Elevation It will fit gun of which rail mount width is 21mm(0.82") (not for picatinny rail)and clearance needed is 1.25". The clearance needed is the distance from rail notch to the front of the trigger guard.