The Timney Calvin Elite AR15 Trigger is engineered for precision with its factory-set 1.5-pound trigger pull. This trigger maintains an ultra-reliable 5-pound hammer spring while providing a crisp and zero creep pull. Included with the trigger are four different shoe styles: curved, flat, heeled, and knurled, allowing customization based on user preference.Key FeaturesPull Weight: Factory set at 1.5 pounds for a light trigger pull.Shoe Options: Comes with four different shoe styles for user customization.Pin Size: Designed for small pin AR-15 models (.156" pin).Compatibility: Fits most AR-15 rifles, excluding some Colt models which require a large .176" pin.Material: Constructed from steel and aluminum for durability.