Arken Optics 4-16X50 34mm Tube First Focal Plane Rifle Scope MRAD VPR. The SH-4GII is a FFP (First Focal Plane) optic that features the AZS System (ARKEN ZERO Stop). The SH-4GII incorporates adjustable elevation and windage turrets with tactile and audible clicks. These turrets offer 8 mils/20 moa per revolution. Specifications for Arken Optics 4-16X50 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) Color: Black Package Contents: Arken Optics 4-16X50 34mm Tube First Focal Plane Rifle Scope Arken Optics SH4GII-4161VPR: 4-16X50 34mm Tube First Focal Plane Rifle Scope MRAD VPR