Ultimate Arms Gear Heckler & Koch H&K HK G3 MP5 Submachine RifleRail Claw Scope Sight Mount + CQB Reticle Red Open Reflex Sight with Weaver-Picatinny Rail Mount 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 Red Color Display 7 Brightness Settings. Tubeless Open Reflex Design. Windage and Elevation Adjustments. Mount is Desgined To Fit H&K G3 MP5 Rifles.