Timney Triggers feature precision machining, workmanship and are individually tested and calibrated by hand. The AR Targa 2-Stage Trigger is a 100 percent drop-in unit that is ready to install in your AR-15 for an exceptionally smooth, crisp, two-stage trigger pull. The pull weight is factory calibrated for a two-pound first stage and a two-pound second stage. The trigger housing is constructed of military grade, 6061 T6 alloy that is CNC machined with an anodized finish. Its hammer is wire EDM cut from S7 tool steel with a Teflon-nickel coating for lubricity. Other components are wire EDM cut from A2 tool steel, then heat treated to Rockwell 58 for long lasting, dependable service life. This short model is compatible with your AR15 firearm, has a small pin, and a standard curved trigger.