This past year we began selling the MagnetoSpeed barrel mounted chronograph. Every time we ordered new inventory we wished we had ordered twice as much. They sold like hotcakes and we simply couldn't keep them in stock. They sold so well because they really work! Check out all the positive customer reviews on our MagnetoSpeed product pages. Customer reviews have been extremely positive but MagnetoSpeed did identify some opportunities to improve upon the original MagnetoSpeed V1 and V2 models. So this year they are releasing the new and improved MagnetoSpeed V3. CLICK HERE for more information or to place a pre-order. We will have inventory ready to ship approximately April 7th.