Originally Posted by
MK18Pilot
50 years of empirical data on chrome lined barrels. Zero vetted data on nitrocarburized RIFLE barrels.
Edit: Click click
Abstract: The procedure as developed by Springfield Armory for design and fabrication of a stellite-lined, chromium-plated barrel for the 5.56mm machine gun is described. Results of erosion tests of the stellite-lined barrels, standard barrels, and two other types of barrels show that the stellite-lined barrels are superior in erosion resistance. One of the stellite-lined barrels was fired 43,994 rounds prior to rejection. A maximum of 12,476 rounds was fired from one of the standard barrels prior to rejection. The two other types of barrels - a standard barrel with a nitrided bore and a barrel of two-piece construction - were fired 29,874 and 990 rounds, respectively, before rejection. The two-piece barrel has an 18-inch forward section made from Cr-Mo-V steel and the rear section, including the chamber, is made entirely of stellite. All barrels were rejected on the basis of the projectile instability criterion - 15 degrees of yaw of 20 per cent of the projectiles fired. All barrels were fired at an average rate of 200 shots per minute.
The study unfortunately invalidates its own usefulness in comparisons by using a plain, unplated barrel as the control instead of a standard chrome-lined barrel, but it's a worthwhile read nonetheless.
-B
Last edited by BAC; 06-23-11 at 19:29.
RIP, Jeff Dorr: 1964 - July 17, 2009
"When young men seek to be like you, when lazy men resent you, when powerful men look over their shoulder at you, when cowardly men plot behind your back, when corrupt men wish you were gone and evil men want you dead . . . Only then will you have done your share." - Phil Messina
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