The FX Biathlon MKII rifle is built in the spirit of the Olympic competition rimfire guns. This MKII version has been updated and rebuilt around the world class FX Smooth Twist X barrel system. The Smooth Twist X rifled barrel chambered in .177 caliber, provides consistent high-level accuracy that will stand up against any match barrel available. The rifle comes with a straight pull biathlon bolt that is indexing, using the distinctive thumb and forefinger method. This cycles a 5 shot straight magazine, made to match the rounds available in biathlon competitions.