The Flash Bolt is a drop-in bolt replacement for standard "AR" platform rifle. It allows any level of shooter to safely shoot a RED laser for dry-fire training. There is no need to cycle the charging handle for repeated shots.This fully adjustable laser allows you to increase proficiency with sight acquisition, trigger control, transitions, and accuracy.The Flash Bolt is meant to build muscle memory, providing the shooter with accuracy and timing feedback while performing the repetitions necessary to allow for your actions to be duplicated automatically when you return to the range or if you are ever thrust into a critical incident.When using the Flash Bolt, you will enjoy the familiar grips and sights of your gun, with the same weight and all the other customizations you made. FeaturesFits many calibers: 9mm** .223 / 5.56, and 300 blackout AR platforms. Adjustable trigger: The Flash Bolt comes with a set of shims, allowing the user to adjust the "trigger" pull/reset sensitivity to ...