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In page M1 Garand:

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The M1 Garand was one of the first self-loading rifles to use stainless steel for its gas tube, in an effort to prevent corrosion.[citation needed] As the stainless metal could not be parkerized, the gas tubes were given a stove-blackening that frequently wore off in use. Unless the gas tube could be quickly repainted, the resultant gleaming muzzle could make the M1 Garand and its user more visible to the enemy in combat.[2]