The MagnetoSpeed Sporter Chronograph is designed to be used on barrels from ½ inch up to 1 inch in diameter. It can also accommodate muzzle brakes and flash hiders up to 2.7 inches in length. The MagnetoSpeed Sporter is ideal for contoured rifle barrels (sporter barrels) and long-barreled revolvers. Our simple one-button cycling display shows recent shot velocity and statistics, simply plug it in to turn it on and start monitoring your stats. It also includes three sensitivity settings for fine tuning your data. <br><br> Our MagnetoSpeed Sporter comes equipped with a 9-volt battery and with easy access to the battery compartment, there is no need for a screwdriver to swap out batteries when they are needed so you can change them on the go. The Sporter also includes an integral quick attach strapping system with metal buckle and triad thumb nut for safety and security. <br><br> The MagnetoSpeed Sporter Kit includes: <br> Display Unit <br> A bayonet-style sensor (Bayo) <br> Both thick and thin rubber V-neck spacers <br> A heavy-duty strap with thumb nut tightener <br> An ultra-compact storage container <br><br> Note: Our MagnetoSpeed Sporter is intended for center-fire rifles and revolvers only. It is not compatible with air guns or rim-fire. Also, please note that it is not compatible with our Large Brake Adapter or our V3 Rail Adapter.