Sightmark's Core TX riflescopes use fully multi-coated optics to provide optimal light transmission in a variety of conditions. The etched glass reticle is illuminated to deliver optimal shot placement and is durable to withstand years of shooting. The exposed, lockable turrets helps maintain a consistent zero and the turrets are quick and easy to adjust to compensate for bullet drop and windage on the fly. The Core TX 3-12x44DCR is housed in a durable 30mm tube, built from aircraft grade aluminum. This scope features a side focus adjustment, a duplex BDC reticle and is calibrated for .223 and .308 ammo.