IGNITION TIME

The elapsed time from moment of firing-pin contact on the primer to the point on the X (time) axis equal to the point where the pressure time curve indicates propellant burning has initiated.

IN LINE

A firearm design incorporating it’s firing mechanism substantially in line with the longitudinal axis of the barrel. Ignition gases are typically induced concentric to the bore with this design.

INDUSTRIAL CARTRIDGE

1. Usually a blank cartridge used in industrial applications such as stud drivers. Usually color coded to indicate power level. Also referred to as power tool cartridges and power actuated tool cartridges. 2. 8 Gauge industrial loads with single projectiles or buckshot used for cleaning continuous cement kilns and other industrial applications.

INERTIA BLOCK

1. A device intended to function during recoil to set the fire control mechanism to fire a second barrel. 2. A device intended to function during recoil to prevent doubling on some double barrel shotguns.