ARKEN OPTICS products are designed to combine quality, performance, and precision with tremendous value. 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. Features: Lifetime Warranty Precision Tracking Guaranteed HD Glass First Focal Plane (FFP) Zero Stop