If any of these have happened to you, they have the fix. Your machine is cooking along, and the clutch kicks in to stop the machine on a sideways bullet. - or - Your machine is moving along and a round without a bullet head falls into your supply of completed rounds spilling powder over your new rounds? - or - A bullet falls off a round (topples) before it is seated? - or - You unknowingly run out of bullets (which creates a mess)? - or - You are brass processing and unknowingly run out of brass? The Mark7 Reloading BulletSense is the first electronic detection system that can stop your machine before any of the situations above impact your loading process. It also can act as a brass sensor. Mark 7 Reloading created a laser-mounted system on a user-adjustable slider that allows you to point the laser right where you want it - at the tip of the bullet or directly on the brass. If the laser beam is interrupted every time your machine makes a stroke, the machine continues ( i.e. if a bullet head or brass is present). If the laser is bounced back from the mirror and the circuit completes, the machine stops at the top of the stroke. You determine the height of the laser, you are now more in control of the operation of your machine. The user-adjustable slider is operated through a traditional thumb screw.