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. To prevent detection, the rifle's muzzle should not protrude through the loophole, particularly at night to hide the muzzle flash.
Not to be confused with Gun show loophole.Contemporary use[edit]
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. Loopholes should be constructed in a seemingly random fashion at varying heights, and include a number of decoy holes in order to avoid drawing fire towards a single obvious hole.[4]