Hawke XB30 Zoom 2-8x36 FFP Crossbow Scope, 470-510 FPS 2-8x magnification 36mm objective 30mm mono-tube For crossbows from 470-510 FPS 1/2 MOA Low-profile capped resettable turrets Fixed parallax at 50 yards Elevation and windage adjust in 1/2 MOA increments 16-layer fully multi-coated lenses Fast focus eyebell Removable zoom throw levers Nitrogen purged Shockproof, fog proof, waterproof First focal plane (FFP) reticle Red and green illumination with multiple brightness settings Hawke no-fault lifetime warranty