This adapter for the Magnetospeed V3 Chronograph (not included) allows the V3 to be used with muzzle brakes up to 7.7" in length and barrel diameters up to 1.6" at the muzzle. It compensates for the brakes found on large calibers like .50 BMG or .338 Lapua and allows the chronograph to get an accurate reading. An included V3 Rail Adapter clamps onto your barrel for easy use with the V3 bayonet is milled from 6061 aluminum.
