Glossary of firearms terms

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Igniting charge
A charge, often included in the primer and generally of black powder, which when placed in contact with the propelling charge is designed to insure maximum inflaming.

Ignition
Setting fire to the powder charge.

Impedimenta
The total equipment carried by troops in the field.

Incendiary bullet see Bullet, incendiary

Indent crimp see Crimp

Indoor range see Range

Inertia firing pin
A firing pin assembled within the breechblock and capable of moving forward or backward therein. A blow from the hammer or striker impels it forward and the explosion of the primer impels it backward.

Inertia lock
A blow back or blow forward action

Inner
On a rifle target, the annular space, valued at three, between the two outer circles.

Instrumental velocity see Velocity

Interior ballistics see Ballistics