Rifle Basix Triggers are manufactured from the highest quality materials. Internal parts are EDM cut from A2 tool steel and then heat treated and polished for consistent performance. This trigger requires the use of the factory safety; gunsmith installation is recommended. Technical InformationMaterial: Heat treated CNC machined tool steel Finish: Blue Features: Adjustable 1-1/2 to 3 lb Gunsmithing Required: Yes Notes: Uses factory safety Fits Ruger 77/22, 77/22 mag, 77/17 Rimfires Safety may need fitting, recommend fitting by qualifed gunsmith