Abrasion in a firearm can come from many sources, both unavoidable and sources caused by the owner. Normal unavoidable abrasion occurs during the firing process, and is most prevalent in smaller rifle calibers that burn large charges of powder. The powder abrades the throat area in front of the chamber after many firings.
Another form of abrasion is commonly caused by the improper use of a cleaning rod. When cleaning if a steel rod or a coated rod with grit on it, is allowed to contact the crown of the muzzle or the rifling, small scratches are abraded into the barrel, ultimately the effect of this abrasion is reduced accuracy and the need for a new barrel.
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