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Understanding Firearm “Wear Parts”: What Wears Out, What to Watch, and When to Seek Help Firearms are mechanical tools. Like any mechanical system, certain components experience repeated stress, friction, heat, and impact—and over time, those parts can fatigue or wear. Knowing what typically wears out (and what “normal” wear looks like) helps you plan upkeep, reduce surprises at the range, and make informed decisions about inspection and professional service. This a …