 Stocks with a rear grip uses standard Remington 700 triggers, while stocks with a center grip need a special trigger linkage system with a long transfer bar.The calibers changed; with the elimination of the original barrel, the reduced powder capacity was no longer such a requirement, and the chamberings switched to standard commercial rifle cartridges.By the time the XP-100 was canceled, it faced stiff competition from other bolt-action pistols such as the Savage Striker as well as the versatile Thompson Center Arms break-action Contender.