From 1979 the rules required a small bore rifle with rim cartridge primer in the .22 LR caliber for biathlon shooting. This caliber, next to air rifle shooting, is used exclusively for the Olympic Summer Games for rifles events. These small bore rifles are relatively heavy, up to 16.5 lbs and have a cylinder action with lateral bolt handle which is lifted and pulled back for loading to feed the cartridge in by hand. Subsequently the action is pulled forward and locked by the lateral bolt handle which is turned downwards. When the biathletes turned to small bore rifles the cylinder action of Anschutz was equipped with a repeater device and a 5-shot magazine and the weight of the rifle was reduced to 9.92 lbs. With the extremely light firing pin with only 4 mm travel this rifle got an extremely short locktime of 4 yards per second.