The BX-Trigger is a light" crisp" drop-in replacement trigger assembly that is compatible with all Ruger 10/22 rifles and 22 Charger pistols. The BX-Trigger is a Genuine Ruger Factory Accessory and is the perfect upgrade for all 10/22 rifles and 22 Charger pistol models because of the significantly reduced pull weight of approximately 2.75 lbs. The BX-Trigger is sold as a complete assembly that drops in to replace the existing trigger assembly.