Loophole (firearm)

A loophole is a protected small opening, which allows a firearm to be aimed and discharged, while providing cover and concealment for the rifleman.

During the First World War, the static movement of trench warfare and a need for protection from snipers created a requirement for loopholes both for discharging firearms and for observation.

I usually lie in front watching, and it is rarely that, if I shot straight, I should not be able to kill or wound nine of every ten men who open them.

These little simple-sounding precautions can save so many lives.One counter-sniper tactic to overcome steel plate loopholes was to wait for a sniper to open the key hole and then fire a large calibre firearm, such as an anti-materiel rifle, to penetrate through the steel plate and eliminate the sniper.

[3] Loopholes remain relevant in modern urban combat typically in walls – these may be already-existing holes, or purpose-made and fortified with sandbags or similar.