ATHLON Ares BTR Gen3, Rifle Scope, 4.5-27X Magnification, First Focal Plane, APLR13 Reticle, 50mm Objective, 30mm Main Tube, Black 212016 The Ares BTR GEN3 HD 4.5-27x50 offers a high-definition viewing experience and a long list of top-tier features without breaking the bank. The 30mm argon-purged tube is crafted from a single piece of aircraft-grade aluminum, which makes it extremely durable and resilient.