What can increased pressure in the barrel be caused by?

Increased pressure in the barrel can occur when there are obstructions that hinder the normal flow of gases after a round is fired. The presence of dirt or excessive oil in the barrel can create a blockage that restricts the expulsion of gases generated by the ignited gunpowder. This obstruction will increase pressure as the gases build up behind it, which can lead to potential malfunctions or even catastrophic failures in the firearm.

Maintaining a clean barrel is crucial not just for accuracy, but for safe operation of the firearm. Regular cleaning ensures that any debris or residual materials that could cause blockages are removed, thus preventing the potentially dangerous situation of increased barrel pressure.