Timney Triggers feature precision machining, workmanship and are individually tested and calibrated by hand. Timney's Calvin Elite series trigger is named for Calvin Motley, Timney's design genius. It features a carbo nitride coating, which provides you with a high quality trigger. The wear components that are made from A2 tool steel, heat-treated to Rockwell 58 and with Teflon-nickel coating, while its lightweight 6061-T6 aluminum housing is CNC machined and anodized Timney Elite Gold. The sear engagement, pull weight, and overtravel are fully adjustable. This adjustable model is compatible with your AR firearm, has a red shoe, and 1.5 lb pull weight.