CRFSC Practice Exam – Complete Guide for Canadian Firearm Safety

Excess oil and grease in the barrel of a firearm poses a significant risk of increased pressure, which can lead to a potential barrel burst. When a firearm is fired, the burning gunpowder creates gas that expands rapidly. If there is excessive lubrication in the barrel, it can create a seal that prevents this gas from escaping efficiently. This buildup of pressure can exceed the structural limits of the barrel, creating a dangerous situation where the barrel could blow apart, posing serious risks to the shooter and anyone nearby.

Addressing the other choices, increased accuracy would not result from excess oil, as a clean, dry barrel tends to provide better accuracy by allowing for more consistent bullet engagement. The notion of decreased range is also inaccurate, as issues with excess lubrication typically revolve around safety rather than distance, and reduced recoil is irrelevant in this context, as recoil mechanics are influenced more by the design of the firearm and ammunition rather than the state of lubrication in the barrel.