Military and other full-auto shooters benefit from chrome lining as it protects the barrel from the high temperatures generated during rapid fire. Chrome lining will make the barrel easier to clean, less susceptible to corrosion and increases the life span. The outside of the barrel is the standard mag-phosphate finish. The chrome coating is electro-mechanically bonded in the barrel and chamber.
A Mag Phosphate coating does nothing other than protect the metal (if properly lubricated).ĬL Chrome lining is usually put in 4140 barrels. A mag-phosphate finish without lubrication can rust. Mag Phosphate is also called Parkerizing. Mag Phospate or manganese (not “magnesium”) phosphate is coating on the outside of the barrel using a sprayed or immersed salt bath to achieve a somewhat porous finish that then more readily accepts and holds some sort of lubrication to help prevent corrosion. 28-36 Rockwell C hardness is normal for 416R. It can be polished and shiny or shot peened and have a matte or dull finish and even chemically colored to a dark finish. Normal hardness of 13 is the same as 4140.Ĥ16R Stainless Steel 416R is the standard SS used for barrels. These barrels are normally heat treated after machining to increase hardness and reduce internal stresses present after machining.Ĥ142 4142 is a chromium-molybdenum alloy steel that has been hardened to 27 to 32 Rockwell C and is ready to use while still being machinable and of exceedingly high strength.Ĥ150 Chromium Molybdenum with some Vanadium added to make the steel tougher but not necessarily harder. Opinions expressed within are those of the author and are not necessarily that of the owners and management of SAA.Ĥ140 Chromoly chrome/molybdenum chromium-molybdenum Normal hardness of 13. If you find factual errors we would be happy to correct them. There is no warranty expressed or implied that the following is perfect. Disclaimer: The following information was done by independent research and may or may not be perfectly accurate and is subject to change and correction without notice.
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