The AR-STONER Two Stage Enhanced Trigger Group for the AR-15 and LR-308 (Small Pin .154") is a mil-spec replacement trigger group featuring a non-adjustable trigger pull. With a first stage pull weight of 2.0lbs and a second stage of 2.5lbs this trigger is perfect for tactical applications or long range precision shooting. The hammer and trigger are nickel boron plated, providing a smooth pull and crisp break, enabling the shooter to stay on target. This trigger is the perfect complement to the AR-STONER Customizable Lower Parts kits (sold separately).FeaturesSmooth and crisp two stage trigger pullPolished mechanical surfaces on the trigger and hammerSelf-lubricating Nickel Boron coatingCompatible with Mil-Spec lower receivers with .154" pin holesFirst Stage: 2.0lbsSecond Stage: 2.5lbsTotal Pull Weight: 4.5lbs