Thirty-nine millimeters, 54 millimeters, 108 millimeters, and 114 millimeters are the lengths of the ammunition cartridges and 5.45 millimeters, 7.62 millimeters, 12.7 millimeters, and 14.5 millimeters the diameters of the bores of small-caliber gun barrels manufactured in those countries that signed the Warsaw Pact.