The Trijicon ACOG 3x24 XB Crossbow Scope is the scope that serious crossbow hunters have been waiting for - purpose-built for crossbow hunting rather than adapted from a rifle application, and calibrated specifically for crossbows firing bolts in the 300-340 fps velocity range. The same legendary ACOG optical quality, battery-free reliability, and rugged construction that military users trust on their rifles, applied directly to the crossbow platform in a configuration that actually matches how crossbow bolts fly. The ACOG Crossbow Scope reticle on the TA50-C-400391 is specifically calibrated for crossbow bolt trajectories at 300-340 fps - the velocity range that covers a wide variety of popular crossbow configurations. The reticle zeroes at 30 yards and extends with stadia lines out to 80 yards in 5-yard increments, giving you practical holdover references for every shot distance that crossbow hunting produces. Bad River Outdoors' patented deer and elk rangefinding capability built into the reticle provides integrated range estimation for game animals using known body dimensions - no separate rangefinder required. The Trijicon TA50 tritium-phosphor lamp and fiber optic system keeps the ACOG 3x24 reticle automatically illuminated and properly contrasted for any lighting condition - from pre-dawn darkness to bright midday sun - without any battery, switch, or manual brightness adjustment. The system reads ambient light and responds automatically, keeping the reticle ready without any input from the shooter. The Trijicon ACOG forged 7075-T6 aluminum housing handles the specific shock pattern that crossbows produce without affecting zero or optical alignment. The internal prism housing adjustment design is inherently more rugged than conventional scope adjustments. Multi-coated broadband anti-reflective lenses deliver outstanding clarity and light transmission. Waterproof to 20 meters. Features: Specifically designed for crossbows Models available for crossbows with velocities at 300-340 fps, 340-400 fps, and 400-440 fps Arrow drop compensation reticle with Bad River Outdoors’ patented deer/elk rangefinding capabilities Rugged design made to withstand the shock patterns of all crossbows Multi-coated, broadband, anti-reflective lenses Battery free operation - illumination provided by tritium-phosphor lamp and fiber optics Trijicon ACOG 3x24 XB Dual Illum Green Chevron 300-340 fps Bolt Drop Crossbow Scope w/Q-LOC Mount TA50-C-400391