Improved: Scope Centerline height raised to AR15 1½" scope height and more room for low profile Rear BUIS. NEW: Blue & Green Color Illuminated reticle, with multiple brightness settings for each color. NEW Improved: Lowered BDC Turret height, for lower mounting height for the Micro Dot Reflex Optic. NEW Improved: Locking Quick Release mount and a more compact QR Lever. The Ultimate Sighting System (USS) Gen II gives you all the Benefits of a Mark III Tactical 3-9X magnified Scope with the Advantage of a Micro Red Dot Reflex Optic for close range targets. This is the perfect platform for the New DXDAB Micro Red Dot Reflex Sight (also included in the USS). 100-500 yard Bullet Drop Compensator (BDC) calibrated for M193 55gr. FMJ Mil-Spec ammo