3-12x44IR Side Focus Rifle Scope. This 3-12x variable magnification optic adopts a heavy-duty 30mm one-piece T6 6061 aluminum tube, built with side adjustable objective design to eliminate parallax for precise long-distance aiming. It features a large 44mm blue coated objective lens that maximizes light transmission for bright, clear sight images even in low light. The etched glass reticle comes with dual red & green illumination to fit all lighting conditions, and diopter adjustment allows you to fine-tune reticle sharpness for personalized vision.