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This research aims to study individual characteristics on surface of a bullet fired from polygonal-rifled barrel and to apply super-high vertical resolution non contact 3D surface profiler to compare individual characteristics on bullet surface. Four 9-mm full metal jacket bullets were fired from three individual semi automatic firearms with polygonal rifling. The results show the efficiency of the super-high vertical resolution non contact 3D surface profiler in identifying the individual characteristics on the surface of a bullet fired from polygonal-rifled barrel. Mean and statistical relationship of depth (Z-axis) of land-engraved areas from the same and different firearms show that the Z-axis of individual characteristics on the surface of a bullet fired from the same polygonal-rifled firearm has no difference in statistical significance at 0.05. Thus, the super-high vertical resolution non contact 3D surface profiler can be applied to identify and compare individual characteristics on the surface of a bullet fired from a polygonal-rifling barrel.
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