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 8.5-25x50MR Marksman is housed in a durable 30mm tube, built from aircraft grade aluminum and features a side focus adjustemtn for parallax removal. The Marksman Reticle (MR) is designed for long range shooting. Its MOA scale allows for ranging targets and features holdovers for bullet drop and wind.