Even a small bit of mud, snow, excess lubricating oil or grease in the bore can cause dangerously increased pressures, causing the barrel to bulge or even burst on firing, which can cause injury to the shooter and bystanders.

• 即使极少量的泥沙、雪、过量的润滑油或油脂都可能导致膛内压力危险地升高，进而造成枪管鼓胀甚至炸裂，而这会严重伤害射手和旁观的人。