A rifle left uncleaned after firing accumulates fouling, a residue of burnt propellant and metal shaved from the bullet's jacket, along the inside of the barrel. Left long enough, this residue attracts moisture and begins to pit the steel with rust, and a pitted barrel loses accuracy in a way that cannot be undone by cleaning after the fact; the metal itself has been damaged. Routine cleaning after use is therefore not primarily about appearance, since a rifle can look clean on the outside while fouling builds invisibly inside the barrel where it matters most.
According to the passage, why is routine cleaning not primarily about appearance?
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Correct answer to question 115 (Paragraph Comprehension): Fouling can build invisibly inside the barrel where a rifle still looks clean outside
Method
The final sentence explains it directly: a rifle can look clean on the outside while fouling builds invisibly inside the barrel where it matters most.
Updated: November 2026
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