Arken Optics 4-16x50mm 34mm Tube Rifle Scope First Focal Plane Illuminated Variable Hunter Reticle MRAD Black. The SH-4 GENII is a FFP (First Focal Plane) optic that features the AZS System (ARKEN Zero Stop). The SH-4 GENII incorporates adjustable elevation and windage turrets with tactile and audible clicks. These turrets offer 8 mils / 20 MOA per revolution. This series is engineered for both precision marksmen requiring repeatable long-range accuracy and dynamic shooters or hunters who demand speed and field reliability. Specifications for Arken Optics 4-16x50mm 34mm Tube First Focal Plane Rifle Scope: Manufacturer: Arken Optics Objective Lens Diameter: 50 mm Magnification: 4 - 16 x Tube Diameter: 34 mm Reticle Focal Plane: First Focal Plane (FFP) Illumination Color: Red Eye Relief: 3.6 in Color: Black Weight: 35.6 oz Illumination Type: LED Battery Type: CR2032 Fabric/Material: Aluminum Magnification Type: Variable Package Contents: Arken Optics 4-16x50mm 34mm Tube First Focal Plane Rifle Scope Arken Optics SH4GII-4161VHR: 4-16x50mm 34mm Tube Rifle Scope First Focal Plane Illuminated Variable Hunter Reticle MRAD Black