Ultimate Arms Gear Tactical Heckler & Koch H&K HK G3 MP 5 MP5 Submachine Gun Rifle Rail Claw Scope Sight Mount + Reticle Red Green Special Battle Edition Open Reflex Sight Matte Black Finish - Aircraft Grade Aluminum Construction. Stanag Dimension Will Accept Stanag scopes, Standard Weaver And Picatinny (7/8") Attachments : Sights - Lasers - Lights Etc. Mount Clamps Directly To Top of Receiver. Features 12 Slot Rails. Once Piece Claw Mount- Easy No Gunsmithing Installation ! 4 Separate Reticle Patterns In Both Red and Green 6 Diferent Brightness Settings (3-Red 3-Green). Tubeless Open Reflex Design. Windage and Elevation Adjustments. Mount is Desgined To Fit H&K G3 MP5 Rifles.