the trigger allows for an incredible amount of custom adjustment on the trigger shoe. Each Timney Calvin Elite trigger features shoes that can be adjusted for length of pull, cast and height, providing shooters with the ability to create the ultimate precision trigger that best fits them. No gunsmith is needed for installation or adjustment, and the trigger features a built-in safety that will not move when the safety is engaged. The trigger is also compatible with left-handed shooters and is ready-to-shoot straight from the box.