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In 1860, after much experimentation aimed at reducing the size of the .44 Colt Holster Pistols, Colt took advantage of stronger mass-produced steel by rebating the frame of the Navy revolver to hold a larger diameter 44/100-inch chambered cylinder. The Colt factory applied the same technology to the 31 Caliber revolvers, configuring them to accept five shot cylinders of 36 caliber. Other changes including lightweight fluted cylinders, round barrels and a ratcheted loading lever resulted in the Police Model of 1862. The Pocket Navy retained the octagonal barrel and traditional loading lever of the earlier pocket model but was up-sized to .36 caliber just like the Pocket Police