A Determination of the Distribution of Chromium Plate in the Bores of Small Arms Barrels
SPRINGFIELD ARMORY MA
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An investigation was made to develop a method for the determination of the distribution of chromium plate in the bores of small arms barrels. Barrels of various calibers were chromium plated according to Springfield Armory procedures. These barrels were then sectioned and the chromium thickness was measured at the lands and grooves. Graphs were plotted of groove chromium thickness versus land chromium thickness for the various barrels. Ratios of land-to-groove chromium plating thicknesses have been established for calibers 0.30, 0.45, 0.50, 20mm, and 30mm barrel bores. These ratios apply to barrel bores which have been chromium plated under existing plating procedures used at Springfield Armory. Procedures are described and results discussed.