The Athlon Helos BTR 1-4.5x24mm Riflescope by Athlon Optics is a versatile optic that was designed for use with AR platforms but can be used with other service rifles as well. Its illuminated ATSR3 second focal plane reticle provides a 0.5 MOA dot in the center of a 12 MOA circle, along with holdover points for compensating for bullet drop. The riflescope's exposed turrets allow for quick adjustments to windage and elevation, while the Precision Zero Stop System makes it easy to return to the original zeroing. The Revolution Lock system on the elevation turret limits the Up adjustment within one revolution of the original zeroing, providing greater precision and ease of use. The Athlon Helos BTR 1-4.5x24mm Riflescope is a reliable and versatile option for anyone in need of a high-quality optic for their rifle. Features of the Helos BTR 1-4.5x24mm Riflescope: Exposed TurretsAllow for quick adjustments to windage and elevationRevolution LockLocks down the original zeroing position and enables the user to dial back to it in one turn. This feature eliminates any doubts on which turn is dialed upEtched Glass ReticleProvides better backing support for complex reticle designs and greater recoil resistanceATSR3 ReticleFeatures a 0.5 MOA dot in the center of a 12 MOA circle and hold-over points to compensate for bullet drop. Illuminated ReticleProvides greater visibility in low-light environments Athlon Helos BTR 1-4.5x24mm Exposed Turrets Zero Stop ATSR3 SFP IR MOA Riflescope 214101