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In page M4 Sherman:

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The Sherman, like its M3 predecessor, was one of the first tanks to feature a gyroscopically stabilized gun and sight. The stabilization was only in the vertical plane; the mechanism could not slew the turret. The stabilizer was sufficient to keep the gun's elevation setting within 1/8th of a degree, or 2 mils, while crossing moderately rough terrain at 15 miles per hour (24 km/h). This gave a hit probability of 70% on enemy tanks at ranges of 300 yards (270 m) to 1,200 yards (1,100 m).[1] The utility of the stabilization is debatable, with some saying it was useful for its intended purpose, others that it was useful only for using the sights for stabilized viewing on the move.[2] Some operators disabled the stabilizer.[citation needed]