Glossary of firearms terms

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Key
A wedge shaped metal piece securing the barrel to the stock by means of corresponding slots in the fore end and a lug on the barrel.

Keyholing
Failure of a bullet to remain gyroscopically balanced along its trajectory. The tumbling that results leaves an elongated hole in the target.

Kick
The sum of recoil components in a firearm as felt by the shooter. Recoil measured by a ballistician does not include factors like muzzle blast, torque and also thrusts determined by the stock shape. These factors are however felt as kick, which varies from one shooter to another.