Hawke Sport Optics established the XB30 as the premier crossbow scope on the market in 2010. Recent upgrades ensure that Hawke maintains its status as the industry leader in crossbow optics. The same vari-speed technology that has made Hawke the leading provider of crossbow optics and reticle design is upgraded in the latest XB30, allowing for calibration on bows up to 450 fps, faster than any crossbow on the market.