Self-contained drop in trigger. Lightweight 6061-T6 CNC Machined aluminum housing with Wire EDM cut, Heat treated steel trigger and sear. Two position, trigger blocking side safety. Fully adjustable Sear Engagement, Over-travel, and pull weight from 1.5-4lbs. Available in blue(black) and Nickel Plated. Teflon nickel coated Sear to guarantee a lifetime of service. Backed by the Legendary Timney Lifetime No Hassle Warranty and Customer service. Mfg: Timney